C8051F34A-GMR Silicon Labs, C8051F34A-GMR Datasheet

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C8051F34A-GMR

Manufacturer Part Number
C8051F34A-GMR
Description
8-bit Microcontrollers - MCU 48 MIPS 64KB 10ADC
Manufacturer
Silicon Labs
Datasheet

Specifications of C8051F34A-GMR

Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
Analog Peripherals
-
-
-
-
USB Function Controller
-
-
-
-
-
-
On-Chip Debug
-
-
-
Voltage Supply Input: 2.7 to 5.25 V
-
Rev. 1.4 9/09
10-Bit ADC (C8051F340/1/2/3/4/5/6/7/A/B only)
Two comparators
Internal voltage reference
(C8051F340/1/2/3/4/5/6/7/A/B only)
Brown-out detector and POR Circuitry
USB specification 2.0 compliant
Full speed (12 Mbps) or low speed (1.5 Mbps) operation
Integrated clock recovery; no external crystal required for
full speed or low speed
Supports eight flexible endpoints
1 kB USB buffer memory
Integrated transceiver; no external resistors required
On-chip debug circuitry facilitates full speed, non-intru-
sive in-system debug (No emulator required)
Provides breakpoints, single stepping, 
inspect/modify memory and registers
Superior performance to emulation systems using
ICE-chips, target pods, and sockets
Voltages from 3.6 to 5.25 V supported using On-Chip 
Voltage Regulator
Up to 200 ksps
Built-in analog multiplexer with single-ended and 
differential mode
VREF from external pin, internal reference, or V
Built-in temperature sensor
External conversion start input option
C8051F340/1/2/34/5/6/7/A/B Only
SENSOR
M
PRECISION INTERNAL
A
U
X
INTERRUPTS
TEMP
PERIPHERALS
ISP FLASH
FLEXIBLE
C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
64/32 kB
Copyright © 2009 by Silicon Laboratories
OSCILLATORS
200 ksps
ANALOG
HIGH-SPEED CONTROLLER CORE
10-bit
ADC
VREF
DD
+
-
VREG
+
-
(48/25 MIPS)
CIRCUITRY
8051 CPU
DEBUG
HIgh Speed 8051 µC Core
-
-
-
Memory
-
-
Digital Peripherals
-
-
-
-
-
Clock Sources
-
-
-
-
Packages
-
-
-
Temperature Range: –40 to +85 °C
* C8051F340/1/4/5/8/A/B/C Only
4 Timers
UART1*
48 Pin Only
UART0
SMBus
PCA
SPI
USB Controller /
Pipelined instruction architecture; executes 70% of
Instructions in 1 or 2 system clocks
48 MIPS and 25 MIPS versions available.
Expanded interrupt handler
4352 or 2304 Bytes RAM
64 or 32 kB Flash; In-system programmable in 512-byte
sectors
40/25 Port I/O; All 5 V tolerant with high sink current
Hardware enhanced SPI™, SMBus™, and one or two
enhanced UART serial ports
Four general purpose 16-bit counter/timers
16-bit programmable counter array (PCA) with five cap-
ture/compare modules
External Memory Interface (EMIF)
Internal Oscillator: ±0.25% accuracy with clock recovery
enabled. Supports all USB and UART modes
External Oscillator: Crystal, RC, C, or clock (1 or 2 Pin
modes)
Low Frequency (80 kHz) Internal Oscillator
Can switch between clock sources on-the-fly
48-pin TQFP (C8051F340/1/4/5/8/C)
32-pin LQFP (C8051F342/3/6/7/9/A/B/D)
5x5 mm 32-pin QFN (C8051F342/3/6/7/9/A/B)
DIGITAL I/O
Transceiver
Full Speed USB Flash MCU Family
4/2 kB RAM
POR
Port 0
Port 1
Port 2
Port 3
Port 4
WDT
C8051F34x

Related parts for C8051F34A-GMR

C8051F34A-GMR Summary of contents

Page 1

Analog Peripherals - 10-Bit ADC (C8051F340/1/2/3/4/5/6/7/A/B only 200 ksps • Built-in analog multiplexer with single-ended and  • differential mode VREF from external pin, internal reference • Built-in temperature sensor • External conversion start input option ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 2 Rev. 1.4 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table of Contents 1. System Overview.................................................................................................... 17 2. Absolute Maximum Ratings .................................................................................. 24 3. Global DC Electrical Characteristics .................................................................... 25 4. Pinout and Package Definitions............................................................................ 28 5. 10-Bit ADC (ADC0, C8051F340/1/2/3/4/5/6/7/A/B Only)........................................ 41 5.1. Analog Multiplexer ............................................................................................ 42 5.2. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11.2.Power-Fail Reset / VDD Monitor .................................................................... 102 11.3.External Reset ................................................................................................ 103 11.4.Missing Clock Detector Reset ........................................................................ 103 11.5.Comparator0 Reset ........................................................................................ 103 11.6.PCA Watchdog Timer Reset .......................................................................... 103 11.7.Flash Error Reset ........................................................................................... 103 11.8.Software Reset ............................................................................................... 104 11.9.USB Reset...................................................................................................... 104 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.5.1.System Clock Selection ......................................................................... 139 14.5.2.USB Clock Selection .............................................................................. 139 15. Port Input/Output.................................................................................................. 142 15.1.Priority Crossbar Decoder .............................................................................. 144 15.2.Port I/O Initialization ....................................................................................... 147 15.3.General Purpose Port I/O ............................................................................... 150 16. Universal Serial Bus Controller (USB0).............................................................. 159 16.1.Endpoint Addressing ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.5.3.Slave Receiver Mode ............................................................................. 201 17.5.4.Slave Transmitter Mode ......................................................................... 202 17.6.SMBus Status Decoding................................................................................. 202 18. UART0.................................................................................................................... 205 18.1.Enhanced Baud Rate Generation................................................................... 206 18.2.Operational Modes ......................................................................................... 206 18.2.1.8-Bit UART ............................................................................................. 207 18.2.2.9-Bit UART ............................................................................................. 208 18.3.Multiprocessor Communications .................................................................... 208 19. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 22.2.2.Software Timer (Compare) Mode........................................................... 259 22.2.3.High Speed Output Mode....................................................................... 260 22.2.4.Frequency Output Mode ........................................................................ 261 22.2.5.8-Bit Pulse Width Modulator Mode......................................................... 262 22.2.6.16-Bit Pulse Width Modulator Mode....................................................... 263 22.3.Watchdog Timer Mode ................................................................................... 264 22.3.1.Watchdog Timer Operation .................................................................... 264 22.3.2.Watchdog Timer ...

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... Figure 1.1. C8051F340/1/4/5 Block Diagram ........................................................... 19 Figure 1.2. C8051F342/3/6/7 Block Diagram ........................................................... 20 Figure 1.3. C8051F348/C Block Diagram................................................................. 21 Figure 1.4. C8051F349/D Block Diagram................................................................. 22 Figure 1.5. C8051F34A/B Block Diagram ................................................................ 23 4. Pinout and Package Definitions Figure 4.1. TQFP-48 Pinout Diagram (Top View) .................................................... 31 Figure 4.2. TQFP-48 Package Diagram ................................................................... 32 Figure 4.3. TQFP-48 Recommended PCB Land Pattern ......................................... 33 Figure 4 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 12. Flash Memory Figure 12.1. Flash Program Memory Map and Security Byte................................. 110 13. External Data Memory Interface and On-Chip XRAM Figure 13.1. USB FIFO Space and XRAM Memory Map  with USBFAE set to ‘1’ ...................................................................................... 115 Figure ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 19.1. UART1 Block Diagram ....................................................................... 213 Figure 19.2. UART1 Timing Without Parity or Extra Bit.......................................... 215 Figure 19.3. UART1 Timing With Parity ................................................................. 215 Figure 19.4. UART1 Timing With Extra Bit ............................................................. 215 Figure 19.5. Typical UART Interconnect ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D List of Tables 1. System Overview Table 1.1. Product Selection Guide ......................................................................... 18 2. Absolute Maximum Ratings Table 2.1. Absolute Maximum Ratings* .................................................................. 24 3. Global DC Electrical Characteristics Table 3.1. Global DC Electrical Characteristics ....................................................... 25 Table 3.2. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 17.2. Minimum SDA Setup and Hold Times ................................................ 193 Table 17.3. Sources for Hardware Changes to SMB0CN ..................................... 197 Table 17.4. SMBus Status Decoding ..................................................................... 203 18. UART0 Table 18.1. Timer Settings for Standard Baud Rates  Using ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D List of Registers SFR Definition 5.1. AMX0P: AMUX0 Positive Channel Select . . . . . . . . . . . . . . . . . . . 48 SFR Definition 5.2. AMX0N: AMUX0 Negative Channel Select ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 14.3. OSCLCN: Internal L-F Oscillator Control . . . . . . . . . . . . . . . . . . 134 SFR Definition 14.4. OSCXCN: External Oscillator Control . . . . . ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.19. EINCSRL: USB0 IN Endpoint Control Low Byte . . . . 182 USB Register Definition 16.20. EINCSRH: USB0 IN Endpoint Control High Byte . . . 183 USB Register Definition 16.21. EOUTCSRL: USB0 OUT  ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 22.6. PCA0CPLn: PCA Capture Module Low Byte . . . . . . . . . . . . . . . 269 SFR Definition 22.7. PCA0CPHn: PCA Capture Module High Byte . . . . . ...

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... User software has complete control of all peripherals, and may individually shut down any or all peripherals for power savings. The on-chip Silicon Labs 2-Wire (C2) Development Interface allows non-intrusive (uses no on-chip resources), full speed, in-circuit debugging using the production MCU installed in the final application. This debug logic supports inspection and modification of memory and registers, setting breakpoints, single stepping, run and halt commands ...

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... C8051F347-GQ 25 32k 2304 C8051F347-GM 25 32k 2304 C8051F348-GQ 25 32k 2304 C8051F349-GQ 25 32k 2304 C8051F349-GM 25 32k 2304 C8051F34A-GQ 48 64k 4352 C8051F34A-GM 48 64k 4352 C8051F34B-GQ 48 32k 2304 C8051F34B-GM 48 32k 2304 C8051F34C-GQ 48 64k 4352 C8051F34D-GQ 48 64k 4352 18       ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D C2D Debug / Programming Hardware C2CK/RST Reset CIP-51 8051 Controller Core Power-On Reset 64/32k Byte ISP FLASH Supply Program Memory Monitor VDD 256 Byte RAM Power Net Voltage VREG 4/2k Byte XRAM Regulator GND System Clock Setup XTAL1 External ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D C2D Debug / Programming Hardware C2CK/RST Reset CIP-51 8051 Controller Core Power-On Reset 64/32 kB ISP FLASH Supply Program Memory Monitor VDD 256 Byte RAM Power Net Voltage VREG 4/2 kB XRAM Regulator GND System Clock Setup XTAL1 External ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D C2D Debug / Programming Hardware C2CK/RST Reset CIP-51 8051 Controller Core Power-On Reset 64/32 kB ISP FLASH Supply Program Memory Monitor VDD 256 Byte RAM Power Net Voltage VREG 4/2 kB XRAM Regulator GND System Clock Setup XTAL1 External ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D C2D Debug / Programming Hardware C2CK/RST Reset CIP-51 8051 Controller Core Power-On Reset 64/32 kB ISP FLASH Supply Program Memory Monitor VDD 256 Byte RAM Power Net Voltage VREG 4/2 kB XRAM Regulator GND System Clock Setup XTAL1 External ...

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... Multiplier Internal Oscillator Clock Low Freq. Recovery Oscillator* USB Peripheral D+ Controller Full / Low D- Speed Transceiver VBUS 1 kB RAM Figure 1.5. C8051F34A/B Block Diagram Port I/O Configuration Digital Peripherals UART0 UART1 Timers Priority Crossbar Decoder PCA/WDT SMBus SPI Crossbar Control SFR Bus ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 2. Absolute Maximum Ratings Table 2.1. Absolute Maximum Ratings* Parameter Ambient temperature under bias Storage Temperature Voltage on any Port I/O Pin or RST with respect to GND Voltage on V with respect to GND DD Maximum Total current ...

Page 25

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 3. Global DC Electrical Characteristics Table 3.1. Global DC Electrical Characteristics –40 to +85 °C, 25 MHz System Clock unless otherwise specified. Parameter 1 Digital Supply Voltage Digital Supply RAM Data Retention Voltage 2 C8051F340/1/2/3/A/B/C/D SYSCLK (System Clock) C8051F344/5/6/7/8/9 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 3.1. Global DC Electrical Characteristics (Continued) –40 to +85 °C, 25 MHz System Clock unless otherwise specified. Parameter 3 Frequency Sensitivity º º ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 3.2. Index to Electrical Characteristics Tables Table Title ADC0 Electrical Characteristics Voltage Reference Electrical Characteristics Comparator Electrical Characteristics Voltage Regulator Electrical Specifications Reset Electrical Characteristics Flash Electrical Characteristics AC Parameters for External Memory Interface Oscillator Electrical Characteristics Port ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 4. Pinout and Package Definitions Table 4.1. Pin Definitions for the C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Pin Numbers Name 48-pin 32-pin GND 7 3 RST C2CK C2D 14 — P3.0 / — 10 C2D REGIN 11 7 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 4.1. Pin Definitions for the C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D (Continued) Pin Numbers Name 48-pin 32-pin P1 I I I I/O or P1.4 42 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 4.1. Pin Definitions for the C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D (Continued) Pin Numbers Name 48-pin 32-pin P3.3 27 — P3.4 26 — P3.5 25 — P3.6 24 — P3.7 23 — P4.0 22 — P4.1 21 — P4.2 20 — P4.3 19 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D P0.5 1 P0.4 2 P0.3 3 P0.2 4 P0.1 5 C8051F340/1/4/5/8/C-GQ P0.0 6 GND VDD 10 REGIN 11 VBUS 12 Figure 4.1. TQFP-48 Pinout Diagram (Top View) Top View Rev. 1.3 P2.2 36 P2.3 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.2. TQFP-48 Package Diagram Table 4.2. TQFP-48 Package Dimensions Dimension aaa bbb ccc ddd  Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.3. TQFP-48 Recommended PCB Land Pattern Table 4.3. TQFP-48 PCB Land Pattern Dimensions Dimension Notes: General: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. This Land Pattern Design is ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D P0.1 1 P0.0 2 GND 3 C8051F342/3/6/7/9/A/B/D- VDD 6 REGIN 7 VBUS 8 Figure 4.4. LQFP-32 Pinout Diagram (Top View) 34 Top View Rev. 1.3 P1.2 24 P1.3 23 P1.4 22 P1.5 21 P1.6 20 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.5. LQFP-32 Package Diagram Table 4.4. LQFP-32 Package Dimensions Dimension Min A — A1 0.05 A2 1.35 b 0. 0.45 aaa bbb ccc ddd  0° Notes: 1. All dimensions ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.6. LQFP-32 Recommended PCB Land Pattern Table 4.5. LQFP-32 PCB Land Pattern Dimensions Dimension Notes: General: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. This Land Pattern Design is ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D P0.1 1 P0.0 2 GND C8051F342/3/6/7/9/A/B-GM Top View D- 5 VDD 6 REGIN 7 GND (optional) VBUS 8 Figure 4.7. QFN-32 Pinout Diagram (Top View) Rev. 1.3 24 P1.2 23 P1.3 22 P1.4 21 P1.5 20 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.8. QFN-32 Package Drawing Table 4.6. QFN-32 Package Dimensions Dimension Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 4.6. QFN-32 Package Dimensions (Continued) Dimension Min L1 0.00 aaa — bbb — ddd — eee — Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 4.9. QFN-32 Recommended PCB Land Pattern Table 4.7. QFN-32 PCB Land Pattern Dimesions Dimension Min C1 4.80 C2 4.80 E 0.50 BSC X1 0.20 Notes: General: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5. 10-Bit ADC (ADC0, C8051F340/1/2/3/4/5/6/7/A/B Only) The ADC0 subsystem for the C8051F34x devices consists of two analog multiplexers (referred to collec- tively as AMUX0), and a 200 ksps, 10-bit successive-approximation-register ADC with integrated track-and-hold and programmable window detector. The ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.1. Analog Multiplexer AMUX0 selects the positive and negative inputs to the ADC. The positive input (AIN+) can be connected to individual Port pins, the on-chip temperature sensor, or the positive power supply (V input (AIN-) can be connected ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.2. Temperature Sensor The temperature sensor transfer function is shown in Figure 5.2. The output voltage (V ADC input when the temperature sensor is selected by bits AMX0P4-0 in register AMX0P. Values for the Offset and Slope parameters can ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.0 0 4.0 0 3.0 0 2.0 0 1.0 0 0.0 0 -40.00 -20.00 -1.00 -2.00 -3.00 -4.00 -5.00 Figure 5.3. Temperature Sensor Error with 1-Point Calibration (VREF = 2. 40.0 0.0 20 Temperature ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.3. Modes of Operation ADC0 has a maximum conversion speed of 200 ksps. The ADC0 conversion clock is a divided version of the system clock, determined by the AD0SC bits in the ADC0CF register (system clock divided by (AD0SC ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.3.2. Tracking Modes The AD0TM bit in register ADC0CN controls the ADC0 track-and-hold mode. In its default state, the ADC0 input is continuously tracked, except when a conversion is in progress. When the AD0TM bit is logic 1, ADC0 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.3.3. Settling Time Requirements When the ADC0 input configuration is changed (i.e., a different AMUX0 selection is made), a minimum tracking time is required before an accurate conversion can be performed. This tracking time is determined by the AMUX0 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 5.1. AMX0P: AMUX0 Positive Channel Select Bit7 Bit6 Bit5 Bits7–5: UNUSED. Read = 000b; Write = don’t care. Bits4–0: AMX0P4–0: AMUX0 Positive Input Selection AMX0P4-0 00000 00001 00010 00011 00100 00101 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 5.2. AMX0N: AMUX0 Negative Channel Select AMX0N4 AMX0N3 AMX0N2 AMX0N1 AMX0N0 00000000 Bit7 Bit6 Bit5 Bits7–5: UNUSED. Read = 000b; Write = don’t care. Bits4–0: AMX0N4–0: AMUX0 Negative Input Selection. Note ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 5.3. ADC0CF: ADC0 Configuration R/W R/W R/W AD0SC4 AD0SC3 AD0SC2 Bit7 Bit6 Bit5 Bits7–3: AD0SC4–0: ADC0 SAR Conversion Clock Period Bits. SAR Conversion clock is derived from system clock by the following equation, where AD0SC refers to ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 5.6. ADC0CN: ADC0 Control R/W R/W R/W AD0EN AD0TM AD0INT AD0BUSY AD0WINT AD0CM2 AD0CM1 AD0CM0 00000000 Bit7 Bit6 Bit5 Bit7: AD0EN: ADC0 Enable Bit. 0: ADC0 Disabled. ADC0 is in low-power shutdown. 1: ADC0 Enabled. ADC0 is ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.4. Programmable Window Detector The ADC Programmable Window Detector continuously compares the ADC0 conversion results to user-programmed limits, and notifies the system when a desired condition is detected. This is especially effective in an interrupt-driven system, saving code space ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 5.9. ADC0LTH: ADC0 Less-Than Data High Byte R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: High byte of ADC0 Less-Than Data Word. SFR Definition 5.10. ADC0LTL: ADC0 Less-Than Data Low Byte R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.4.1. Window Detector In Single-Ended Mode Figure 5.6 shows two example window comparisons for right-justified, single-ended data, with ADC0LTH:ADC0LTL = 0x0080 (128d) and ADC0GTH:ADC0GTL = 0x0040 (64d). In single-ended mode, the input voltage can range from ‘0’ to VREF ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 5.4.2. Window Detector In Differential Mode Figure 5.8 shows two example window comparisons for right-justified, differential data, with ADC0LTH:ADC0LTL = 0x0040 (+64d) and ADC0GTH:ADC0GTH = 0xFFFF (-1d). In differential mode, the measurable voltage between the input pins is between ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 5.1. ADC0 Electrical Characteristics V = 3.0 V, VREF = 2.40 V, –40 to +85 °C unless otherwise specified DD Parameter Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Full Scale Error Offset Temperature Coefficient Dynamic Performance (10 kHz ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 6. Voltage Reference (C8051F340/1/2/3/4/5/6/7/A/B Only) The Voltage reference MUX on C8051F34x devices is configurable to use an externally connected voltage reference, the on-chip reference voltage generator, or the power supply voltage V REFSL bit in the Reference Control register ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 6.1. REF0CN: Reference Control R/W R/W R Bit7 Bit6 Bit5 Bits7–3: UNUSED. Read = 00000b; Write = don’t care. Bit3: REFSL: Voltage Reference Select. This bit selects the source for the internal voltage reference. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 7. Comparators C8051F34x devices include two on-chip programmable voltage Comparators. A block diagram of the com- parators is shown in Figure 7.1, where “n” is the comparator number (0 or 1). The two Comparators oper- ate identically with the ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D CPnEN CPnOUT CPnRIF CPnFIF CMXnN2 CPnHYP1 CMXnN1 CPnHYP0 CMXnN0 CPnHYN1 CPnHYN0 CMXnP2 CMXnP1 CMXnP0 Port I/O connection options vary with package (32-pin or 48-pin) Figure 7.1. Comparator Functional Block Diagram Comparator outputs can be polled in software, used as ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D CP0+ VIN+ + CP0 CP0- _ VIN- CIRCUIT CONFIGURATION Positive Hysteresis Voltage (Programmed with CP0HYP Bits) VIN- INPUTS VIN OUTPUT V OL Positive Hysteresis Disabled Figure 7.2. Comparator Hysteresis Plot Comparator hysteresis is programmed using Bits3-0 in ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.1. CPT0CN: Comparator0 Control R/W R R/W CP0EN CP0OUT CP0RIF Bit7 Bit6 Bit5 Bit7: CP0EN: Comparator0 Enable Bit. 0: Comparator0 Disabled. 1: Comparator0 Enabled. Bit6: CP0OUT: Comparator0 Output State Flag. 0: Voltage on CP0+ < CP0–. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.2. CPT0MX: Comparator0 MUX Selection R/W R/W R/W - CMX0N2 CMX0N1 CMX0N0 Bit7 Bit6 Bit5 Bit7: UNUSED. Read = 0b, Write = don’t care. Bits6–4: CMX0N2–CMX0N0: Comparator0 Negative Input MUX Select. These bits select which Port pin ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.3. CPT0MD: Comparator0 Mode Selection R/W R/W R CP0RIE Bit7 Bit6 Bit5 Bits7–6: UNUSED. Read = 00b. Write = don’t care. Bit5: CP0RIE: Comparator0 Rising-Edge Interrupt Enable. 0: Comparator0 rising-edge interrupt disabled. 1: Comparator0 rising-edge ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.4. CPT1CN: Comparator1 Control R/W R R/W CP1EN CP1OUT CP1RIF Bit7 Bit6 Bit5 Bit7: CP1EN: Comparator1 Enable Bit. 0: Comparator1 Disabled. 1: Comparator1 Enabled. Bit6: CP1OUT: Comparator1 Output State Flag. 0: Voltage on CP1+ < CP1–. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.5. CPT1MX: Comparator1 MUX Selection R/W R/W R/W - CMX1N2 CMX1N1 CMX1N0 Bit7 Bit6 Bit5 Bit7: UNUSED. Read = 0b, Write = don’t care. Bits6–4: CMX1N2–CMX1N0: Comparator1 Negative Input MUX Select. These bits select which Port pin ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 7.6. CPT1MD: Comparator1 Mode Selection R/W R/W R CP1RIE CP1FIE Bit7 Bit6 Bit5 Bits7–6: UNUSED. Read = 00b, Write = don’t care. Bit5: CP1RIE: Comparator1 Rising-Edge Interrupt Enable. 0: Comparator1 rising-edge interrupt disabled. 1: Comparator1 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 7.1. Comparator Electrical Characteristics V = 3.0 V, –40 to +85 °C unless otherwise noted. DD All specifications apply to both Comparator0 and Comparator1 unless otherwise noted. Parameter CP0+ – CP0– = 100 mV Response Time: Mode 0, ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 8. Voltage Regulator (REG0) C8051F34x devices include a voltage regulator (REG0). When enabled, the REG0 output appears on the V pin and can be used to power external devices. REG0 can be enabled/disabled by software using bit DD REGEN ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D VBUS From VBUS REGIN VDD Power Net Figure 8.1. REG0 Configuration: USB Bus-Powered VBUS From VBUS From 5 V REGIN Power Net VDD Power Net Figure 8.2. REG0 Configuration: USB Self-Powered 70 VBUS ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D VBUS From VBUS REGIN From 3 V VDD Power Net Figure 8.3. REG0 Configuration: USB Self-Powered, Regulator Disabled VBUS From 5 V REGIN Power Net VDD Power Net Figure 8.4. REG0 Configuration: No USB Connection VBUS ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 8.1. REG0CN: Voltage Regulator Control R/W R R/W REGDIS VBSTAT VBPOL Bit7 Bit6 Bit5 Bit7: REGDIS: Voltage Regulator Disable. 0: Voltage Regulator Enabled. 1: Voltage Regulator Disabled. Bit6: VBSTAT: VBUS Signal Status. 0: VBUS signal currently absent ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9. CIP-51 Microcontroller The MCU system controller core is the CIP-51 microcontroller. The CIP-51 is fully compatible with the MCS-51™ instruction set; standard 803x/805x assemblers and compilers can be used to develop soft- ware. The MCU family has a ...

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... C2. The two C2 interface pins can be shared with user functions, allowing in-system debugging with- out occupying package pins. C2 details can be found in The CIP-51 is supported by development tools from Silicon Labs and third party vendors. Silicon Labs pro- vides an integrated development environment (IDE) including editor, debugger, and programmer. The IDE's debugger and programmer interface to the CIP-51 via the C2 interface to provide fast and efficient in-system device programming and debugging. An 8051 assembler, linker and evaluation ‘ ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.1.2. MOVX Instruction and Program Memory In the CIP-51, the MOVX instruction serves three purposes: accessing on-chip XRAM, accessing off-chip data XRAM (only on C8051F340/1/4/5/8 devices), and accessing on-chip program Flash memory. The Flash access feature provides a mechanism ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.1. CIP-51 Instruction Set Summary (Continued) Mnemonic ORL A, #data OR immediate to A ORL direct direct byte ORL direct, #data OR immediate to direct byte XRL A, Rn Exclusive-OR Register to A XRL ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.1. CIP-51 Instruction Set Summary (Continued) Mnemonic CLR C Clear Carry CLR bit Clear direct bit SETB C Set Carry SETB bit Set direct bit CPL C Complement Carry CPL bit Complement direct bit ANL C, bit AND ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Notes on Registers, Operands and Addressing Modes Register R0-R7 of the currently selected register bank. @Ri - Data RAM location addressed indirectly through R0 or R1. rel - 8-bit, signed (two’s complement) offset relative to the first ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.2. Memory Organization The memory organization of the CIP-51 System Controller is similar to that of a standard 8051. There are two separate memory spaces: program memory and data memory. Program and data memory share the same address space ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D PROGRAM/DATA MEMORY (FLASH) 0x7FFF FLASH (In-System Programmable in 512 Byte Sectors) 0x0000 Figure 9.3. On-Chip Memory Map for 32 kB Devices 9.2.1. Program Memory The CIP-51 core has a 64k-byte program memory space. The C8051F34x implements 64k or 32k ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.2.2. Data Memory The CIP-51 includes 256 of internal RAM mapped into the data memory space from 0x00 through 0xFF. The lower 128 bytes of data memory are used for general purpose registers and scratch pad memory. Either direct ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.2.6. Special Function Registers The direct-access data memory locations from 0x80 to 0xFF constitute the special function registers (SFRs). The SFRs provide control and data exchange with the CIP-51's resources and peripherals. The CIP-51 duplicates the SFRs found in ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.3. Special Function Registers SFRs are listed in alphabetical order. All undefined SFR locations are reserved. Register Address Description ACC 0xE0 Accumulator ADC0CF 0xBC ADC0 Configuration ADC0CN 0xE8 ADC0 Control ADC0GTH 0xC4 ADC0 Greater-Than Compare High ADC0GTL 0xC3 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.3. Special Function Registers (Continued) SFRs are listed in alphabetical order. All undefined SFR locations are reserved. Register Address Description P1MDIN 0xF2 Port 1 Input Mode Configuration P1MDOUT 0xA5 Port 1 Output Mode Configuration P1SKIP 0xD5 Port 1 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.3. Special Function Registers (Continued) SFRs are listed in alphabetical order. All undefined SFR locations are reserved. Register Address Description SBUF0 0x99 UART0 Data Buffer SCON0 0x98 UART0 Control SMB0CF 0xC1 SMBus Configuration SMB0CN 0xC0 SMBus Control SMB0DAT ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.2.7. Register Descriptions Following are descriptions of SFRs related to the operation of the CIP-51 System Controller. Reserved bits should not be set to logic l. Future product versions may use these bits to implement new features in which ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.4. PSW: Program Status Word R/W R/W R Bit7 Bit6 Bit5 Bit7: CY: Carry Flag. This bit is set when the last arithmetic operation resulted in a carry (addition borrow (subtraction). It ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9. Register R/W R/W R/W B.7 B.6 B.5 Bit7 Bit6 Bit5 Bits7– Register. This register serves as a second accumulator for certain arithmetic operations. 9.3. Interrupt Handler The CIP-51 includes an extended interrupt ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D IT0 IN0PL INT0 Interrupt 1 0 Active low, edge sensitive 1 1 Active high, edge sensitive 0 0 Active low, level sensitive 0 1 Active high, level sensitive INT0 and INT1 are assigned to Port pins as defined in ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 9.4. Interrupt Summary Interrupt Interrupt Source Vector Reset 0x0000 External Interrupt 0 0x0003 (INT0) Timer 0 Overflow 0x000B External Interrupt 1 0x0013 (INT1) Timer 1 Overflow 0x001B UART0 0x0023 Timer 2 Overflow 0x002B SPI0 0x0033 SMB0 0x003B USB0 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.7. IE: Interrupt Enable R/W R/W R/W EA ESPI0 ET2 Bit7 Bit6 Bit5 Bit7: EA: Enable All Interrupts. This bit globally enables/disables all interrupts. It overrides the individual interrupt mask set- tings. 0: Disable all interrupt sources. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.8. IP: Interrupt Priority R/W R/W R/W - PSPI0 PT2 Bit7 Bit6 Bit5 Bit7: UNUSED. Read = 1, Write = don't care. Bit6: PSPI0: Serial Peripheral Interface (SPI0) Interrupt Priority Control. This bit sets the priority of ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.9. EIE1: Extended Interrupt Enable 1 R/W R/W R/W ET3 ECP1 ECP0 Bit7 Bit6 Bit5 Bit7: ET3: Enable Timer 3 Interrupt. This bit sets the masking of the Timer 3 interrupt. 0: Disable Timer 3 interrupts. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.10. EIP1: Extended Interrupt Priority 1 R/W R/W R/W PT3 PCP1 PCP0 Bit7 Bit6 Bit5 Bit7: PT3: Timer 3 Interrupt Priority Control. This bit sets the priority of the Timer 3 interrupt. 0: Timer 3 interrupts set ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.11. EIE2: Extended Interrupt Enable 2 R/W R/W R Bit7 Bit6 Bit5 Bits7–2: UNUSED. Read = 000000b. Write = don’t care. Bit1: ES1: Enable UART1 Interrupt. This bit sets the masking of the UART1 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.13. IT01CF: INT0/INT1 Configuration R/W R/W R/W IN1PL IN1SL2 IN1SL1 Bit7 Bit6 Bit5 Note: Refer to SFR Definition 21.1 for INT0/1 edge- or level-sensitive interrupt selection. Bit7: IN1PL: INT1 Polarity 0: INT1 input is active low. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 9.4. Power Management Modes The CIP-51 core has two software programmable power management modes: Idle and Stop. Idle mode halts the CPU while leaving the peripherals and clocks active. In Stop mode, the CPU is halted, all inter- rupts, ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 9.14. PCON: Power Control R/W R/W R/W GF5 GF4 GF3 Bit7 Bit6 Bit5 Bits7–2: GF5–GF0: General Purpose Flags 5–0. These are general purpose flags for use under software control. Bit1: STOP: Stop Mode Select. Setting this bit ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 10. Prefetch Engine The 48 MHz versions of the C8051F34x family of devices incorporate a 2-byte prefetch engine. Because the access time of the FLASH memory is 40 ns, and the minimum instruction time is roughly 20 ns, the ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11. Reset Sources Reset circuitry allows the controller to be easily placed in a predefined default condition. On entry to this reset state, the following occur: • CIP-51 halts program execution • Special Function Registers (SFRs) are initialized to ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11.1. Power-On Reset During power-up, the device is held in a reset state and the RST pin is driven low until Power-On Reset delay (T RST PORDelay typically less than 0.3 ms. Figure 11.2. plots ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11.2. Power-Fail Reset / V DD When a power-down transition or power irregularity causes V monitor will drive the RST pin low and hold the CIP- reset state (see Figure 11.2). When level above ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11.3. External Reset The external RST pin provides a means for external circuitry to force the device into a reset state. Assert- ing an active-low signal on the RST pin generates a reset; an external pull-up and/or decoupling of ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 11.8. Software Reset Software may force a reset by writing a ‘1’ to the SWRSF bit (RSTSRC.4). The SWRSF bit will read ‘1’ fol- lowing a software forced reset. The state of the RST pin is unaffected by this ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 11.2. RSTSRC: Reset Source R/W R R/W USBRSF FERROR C0RSEF SWRSF Bit7 Bit6 Bit5 Bit7: USBRSF: USB Reset Flag 0: Read: Last reset was not a USB reset; Write: USB resets disabled. 1: Read: Last reset was ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 11.1. Reset Electrical Characteristics –40 to +85 °C unless otherwise specified. Parameter I = 8.5 mA, V RST Output Low Voltage OL RST Input High Voltage RST Input Low Voltage RST Input Pull-Up Current RST = 0.0 V ...

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... Programming The Flash Memory The simplest means of programming the Flash memory is through the C2 interface using programming tools provided by Silicon Labs or a third party vendor. This is the only means for programming a non-initial- ized device. For details on the C2 commands to program Flash memory, see on page 271 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 12.1.3. Flash Write Procedure Bytes in Flash memory can be written one byte at a time groups of two. The FLBWE bit in register PFE0CN (SFR Definition 10.1) controls whether a single byte or a block of ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 12.1. Flash Electrical Characteristics Parameter C8051F340/2/4/6/A/C/D* Flash Size C8051F341/3/5/7/8/9/B Endurance Erase Cycle Time 25 MHz System Clock Write Cycle Time 25 MHz System Clock *Note: 1024 bytes at location 0xFC00 to 0xFFFF are reserved. 12.2. Non-Volatile Data Storage ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D C8051F340/2/4/6/A/C/D Reserved Lock Byte FLASH memory organized in 512-byte pages Unlocked FLASH Pages Figure 12.1. Flash Program Memory Map and Security Byte 110 0xFC00 0xFBFF Locked when any 0xFBFE other FLASH pages are locked 0xFA00 C8051F341/3/5/7/8/9/B Unlocked FLASH Pages ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D The level of FLASH security depends on the FLASH access method. The three FLASH access methods that can be restricted are reads, writes, and erases from the C2 debug interface, user firmware executing on unlocked pages, and user firmware ...

Page 112

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 12.1. PSCTL: Program Store R/W Control R/W R/W R Bit7 Bit6 Bit5 Bits7–3: Unused: Read = 00000b. Write = don’t care. Bit2: Reserved. Read = 0b. Must Write = 0b. Bit1: PSEE: Program Store ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 12.3. FLSCL: Flash Scale R/W R/W R/W FOSE Reserved Reserved Bit7 Bit6 Bit5 Bits7: FOSE: Flash One-shot Enable This bit enables the Flash read one-shot. When the Flash one-shot disabled, the Flash sense amps are enabled for ...

Page 114

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13. External Data Memory Interface and On-Chip XRAM 4k Bytes (C8051F340/2/4/6/A/C/ Bytes (C8051F341/3/5/7/8/9/B) of RAM are included on-chip, and mapped into the external data memory space (XRAM). The 1k Bytes of USB FIFO space can also be ...

Page 115

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.2. Accessing USB FIFO Space The C8051F34x devices include 1k of RAM which functions as USB FIFO space. Figure 13.1 shows an expanded view of the FIFO space and user XRAM. FIFO space is normally accessed via USB FIFO ...

Page 116

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.3. Configuring the External Memory Interface Configuring the External Memory Interface consists of five steps: 1. Configure the Output Modes of the associated port pins as either push-pull or open-drain (push-pull is most common), and skip the associated pins ...

Page 117

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 13.1. EMI0CN: External Memory Interface Control R/W R/W R/W PGSEL7 PGSEL6 PGSEL5 PGSEL4 Bit7 Bit6 Bit5 Bits7–0: PGSEL[7:0]: XRAM Page Select Bits. The XRAM Page Select Bits provide the high byte of the 16-bit external data memory ...

Page 118

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 13.2. EMI0CF: External Memory Configuration R/W R/W R/W - USBFAE - Bit7 Bit6 Bit5 Bit7: Unused. Read = 0b. Write = don’t care. Bit6: USBFAE: USB FIFO Access Enable. 0: USB FIFO RAM not available through MOVX ...

Page 119

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.5. Multiplexed and Non-multiplexed Selection The External Memory Interface is capable of acting in a Multiplexed mode or a Non-multiplexed mode, depending on the state of the EMD2 (EMI0CF.4) bit. 13.5.1. Multiplexed Configuration In Multiplexed mode, the Data Bus ...

Page 120

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.5.2. Non-multiplexed Configuration In Non-multiplexed mode, the Data Bus and the Address Bus pins are not shared. An example of a Non-multiplexed Configuration is shown in Figure 13.3. See page 124 for more information about Non-multiplexed operation. A[15:0] E ...

Page 121

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.6.1. Internal XRAM Only When EMI0CF.[3:2] are set to ‘00’, all MOVX instructions will target the internal XRAM space on the device. Memory accesses to addresses beyond the populated space will wrap boundaries (depending on ...

Page 122

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.6.3. Split Mode with Bank Select When EMI0CF.[3:2] are set to ‘10’, the XRAM memory map is split into two areas, on-chip space and off-chip space. • Effective addresses below the internal XRAM size boundary will access on-chip XRAM ...

Page 123

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 13.3. EMI0TC: External Memory Timing Control R/W R/W R/W EAS1 EAS0 EWR3 Bit7 Bit6 Bit5 Bits7–6: EAS1–0: EMIF Address Setup Time Bits. 00: Address setup time = 0 SYSCLK cycles. 01: Address setup time = 1 SYSCLK ...

Page 124

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.1. Non-multiplexed Mode 13.7.1.1.16-bit MOVX: EMI0CF[4:2] = ‘101’, ‘110’, or ‘111’. ADDR[15:8] P2 ADDR[7:0] P3 DATA[7: P1.7 RD P1.6 ADDR[15:8] P2 ADDR[7:0] P3 DATA[7: P1.6 WR P1.7 Figure 13.5. Non-multiplexed 16-bit MOVX Timing 124 Nonmuxed ...

Page 125

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.1.2.8-bit MOVX without Bank Select: EMI0CF[4:2] = ‘101’ or ‘111’. ADDR[15:8] ADDR[7:0] P3 DATA[7: P1.7 RD P1.6 ADDR[15:8] ADDR[7:0] P3 DATA[7: P1.6 WR P1.7 Figure 13.6. Non-multiplexed 8-bit MOVX without Bank Select Timing Nonmuxed 8-bit ...

Page 126

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.1.3.8-bit MOVX with Bank Select: EMI0CF[4:2] = ‘110’. ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ALEH ALE P1.3 WR P1.7 RD P1.6 ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ...

Page 127

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.2. Multiplexed Mode 13.7.2.1.16-bit MOVX: EMI0CF[4:2] = ‘001’, ‘010’, or ‘011’. ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ALEH ALE P1.3 WR P1.7 RD P1.6 ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ALEH ...

Page 128

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.2.2.8-bit MOVX without Bank Select: EMI0CF[4:2] = ‘001’ or ‘011’. ADDR[15:8] EMIF ADDRESS (8 LSBs) from AD[7: ALEH ALE P1.3 WR P1.7 RD P1.6 ADDR[15:8] EMIF ADDRESS (8 LSBs) from AD[7: ...

Page 129

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 13.7.2.3.8-bit MOVX with Bank Select: EMI0CF[4:2] = ‘010’. ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ALEH ALE P1.3 WR P1.7 RD P1.6 ADDR[15:8] P3 EMIF ADDRESS (8 LSBs) from AD[7: ...

Page 130

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 13.1. AC Parameters for External Memory Interface Parameter Description T Address / Control Setup Time ACS T Address / Control Pulse Width ACW T Address / Control Hold Time ACH T Address Latch Enable High Time ALEH T ...

Page 131

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14. Oscillators C8051F34x devices include a programmable internal high-frequency oscillator, a programmable internal low-frequency oscillator (C8051F340/1/2/3/4/5/8/9/A/B/C/D), an external oscillator drive circuit, and a 4x Clock Multiplier. The internal high-frequency and low-frequency oscillators can be enabled/disabled and adjusted using the ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.1. Programmable Internal High-Frequency (H-F) Oscillator All C8051F34x devices include a programmable internal oscillator that defaults as the system clock after a system reset. The internal oscillator period can be programmed via the OSCICL register shown in SFR Definition ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 14.2. OSCICL: Internal H-F Oscillator Calibration R/W R/W R Bit7 Bit6 Bit5 Bits4–0: OSCCAL: Oscillator Calibration Value These bits determine the internal H-F oscillator period. When set to 00000b, the oscillator operates at its ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 14.3. OSCLCN: Internal L-F Oscillator Control R/W R R/W OSCLEN OSCLRDY OSCLF3 Bit7 Bit6 Bit5 Bit7: OSCLEN: Internal L-F Oscillator Enable. 0: Internal L-F Oscillator Disabled. 1: Internal L-F Oscillator Enabled. Bit6: OSCLRDY: Internal L-F Oscillator Ready ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.3. External Oscillator Drive Circuit The external oscillator circuit may drive an external crystal, ceramic resonator, capacitor network. A CMOS clock may also provide a clock input. For a crystal or ceramic resonator configuration, the crystal/ resonator ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.3.3. External RC Example network is used as an external oscillator source for the MCU, the circuit should be configured as shown in Figure 14.1, Option 2. The capacitor should be no greater than 100 pF; ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 14.4. OSCXCN: External Oscillator Control R R/W R/W XTLVLD XOSCMD2 XOSCMD1 XOSCMD0 Bit7 Bit6 Bit5 Bit7: XTLVLD: Crystal Oscillator Valid Flag. (Read only when XOSCMD = 11x.) 0: Crystal Oscillator is unused or not yet stable. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.4. 4x Clock Multiplier The 4x Clock Multiplier allows a 12 MHz oscillator to generate the 48 MHz clock required for Full Speed USB communication (see Section “16.4. USB Clock Configuration” on page 166 the Multiplier output can also ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 14.5. System and USB Clock Selection The internal oscillator requires little start-up time and may be selected as the system or USB clock immedi- ately following the OSCICN write that enables the internal oscillator. External crystals and ceramic resona- ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Internal Oscillator Clock Signal Input Source Selection USB Clock External Oscillator / 4 Crystal Oscillator Mode External Oscillator 24 MHz Crystal SFR Definition 14.6. CLKSEL: Clock Select R/W R/W R/W - USBCLK Bit7 Bit6 Bit5 Bit 7: Unused. Read ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 14.1. Oscillator Electrical Characteristics V = 2.7 to 3.6 V; –40 to +85 °C unless otherwise specified DD Parameter Internal High-Frequency Oscillator (Using Factory-Calibrated Settings) Oscillator Frequency IFCN = 11b Oscillator Supply Current  24 ºC, V (from ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 15. Port Input/Output Digital and analog resources are available through 40 I/O pins (48-pin packages I/O pins (32-pin packages). Port pins are organized as shown in Figure 15.1. Each of the Port pins can be defined as ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C LLU nalog ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 15.1. Priority Crossbar Decoder The Priority Crossbar Decoder (Figure 15.3) assigns a priority to each I/O function, starting at the top with UART0. When a digital resource is selected, the least-significant unassigned Port pin is assigned to that resource ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C Signals (32-pin Package) SF Signals (48-pin Package) PIN I TX0 RX0 SCK MISO MOSI NSS* *NSS is only pinned out in 4-wire SPI mode SDA SCL CP0 CP0A ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C Signa ls (32-pin P a cka Signa ls (48-pin P a cka I RX0 S CK ...

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... Port I/O (in input mode), regardless of the XBRn Register settings. For given XBRn Register settings, one can determine the I/O pin-out using the Priority Decode Table alternative, the Configuration Wizard utility of the Silicon Labs IDE software will determine the Port I/O pin-assignments based on the XBRn Register settings. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.1. XBR0: Port I/O Crossbar Register 0 R/W R/W R/W CP1AE CP1E CP0AE Bit7 Bit6 Bit5 Bit7: CP1AE: Comparator1 Asynchronous Output Enable 0: Asynchronous CP1 unavailable at Port pin. 1: Asynchronous CP1 routed to Port pin. Bit6: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.2. XBR1: Port I/O Crossbar Register 1 R/W R/W R/W WEAKPUD XBARE T1E Bit7 Bit6 Bit5 Bit7: WEAKPUD: Port I/O Weak Pull-up Disable. 0: Weak Pull-ups enabled (except for Ports whose I/O are configured as analog input ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 15.3. General Purpose Port I/O Port pins that remain unassigned by the Crossbar and are not used by analog peripherals can be used for general purpose I/O. Ports 3-0 are accessed through corresponding special function registers (SFRs) that are ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.6. P0MDOUT: Port0 Output Mode R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: Output Configuration Bits for P0.7–P0.0 (respectively): ignored if corresponding bit in regis- ter P0MDIN is logic 0. 0: Corresponding P0.n Output is open-drain. 1: Corresponding ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.8. P1: Port1 Latch R/W R/W R/W P1.7 P1.6 P1.5 Bit7 Bit6 Bit5 Bits7–0: P1.[7:0] Write - Output appears on I/O pins per Crossbar Registers (when XBARE = ‘1’). 0: Logic Low Output. 1: Logic High Output ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.11. P1SKIP: Port1 Skip R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: P1SKIP[7:0]: Port1 Crossbar Skip Enable Bits. These bits select Port pins to be skipped by the Crossbar Decoder. Port pins used as ana- log inputs (for ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.14. P2MDOUT: Port2 Output Mode R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: Output Configuration Bits for P2.7–P2.0 (respectively): ignored if corresponding bit in regis- ter P2MDIN is logic 0. 0: Corresponding P2.n Output is open-drain. 1: Corresponding ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.16. P3: Port3 Latch R/W R/W R/W P3.7 P3.6 P3.5 Bit7 Bit6 Bit5 Bits7–0: P3.[7:0] Write - Output appears on I/O pins. 0: Logic Low Output. 1: Logic High Output (high impedance if corresponding P3MDOUT.n bit = ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.19. P3SKIP: Port3 Skip R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: P3SKIP[3:0]: Port3 Crossbar Skip Enable Bits. These bits select Port pins to be skipped by the Crossbar Decoder. Port pins used as ana- log inputs (for ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 15.21. P4MDIN: Port4 Input Mode R/W R/W R/W Bit7 Bit6 Bit5 Bits7–0: Analog Input Configuration Bits for P4.7–P4.0 (respectively). Port pins configured as analog inputs have their weak pull-up, digital driver, and digital receiver disabled. 0: Corresponding ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 15.1. Port I/O DC Electrical Characteristics V = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified DD Parameters I = –3 mA, Port I/O push-pull –10 µA, Port I/O push-pull Output High ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16. Universal Serial Bus Controller (USB0) C8051F34x devices include a complete Full/Low Speed USB function for USB peripheral implementa- tions*. The USB Function Controller (USB0) consists of a Serial Interface Engine (SIE), USB Transceiver (including matching resistors and configurable ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.1. Endpoint Addressing A total of eight endpoint pipes are available. The control endpoint (Endpoint0) always functions as a bi-directional IN/OUT endpoint. The other endpoints are implemented as three pairs of IN/OUT endpoint pipes: Table 16.1. Endpoint Addressing Scheme ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 16.1. USB0XCN: USB0 Transceiver Control R/W R/W R/W PREN PHYEN SPEED PHYTST1 PHYTST0 DFREC Bit7 Bit6 Bit5 Bit7: PREN: Internal Pull-up Resistor Enable The location of the pull-up resistor (D+ or D–) is determined by the SPEED ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.3. USB Register Access The USB0 controller registers listed in Table 16.2 are accessed through two SFRs: USB0 Address (USB0ADR) and USB0 Data (USB0DAT). The USB0ADR register selects which USB register is targeted by reads/writes of the USB0DAT register. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 16.2. USB0ADR: USB0 Indirect Address R/W R/W R/W BUSY AUTORD Bit7 Bit6 Bit5 Bits7: BUSY: USB0 Register Read Busy Flag This bit is used during indirect USB0 register accesses. Software should write ‘1’ to this bit to ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 16.3. USB0DAT: USB0 Data R/W R/W R/W Bit7 Bit6 Bit5 This SFR is used to indirectly read and write USB0 registers. Write Procedure: 1. Poll for BUSY (USB 0ADR.7) => ‘0’. 2. Load the target USB0 register ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 16.2. USB0 Controller Registers USB Register USB Register Name Address IN1INT 0x02 OUT1INT 0x04 CMINT 0x06 IN1IE 0x07 OUT1IE 0x09 CMIE 0x0B FADDR 0x00 POWER 0x01 FRAMEL 0x0C FRAMEH 0x0D INDEX 0x0E CLKREC 0x0F FIFOn 0x20–0x23 E0CSR 0x11 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.4. USB Clock Configuration USB0 is capable of communication as a Full or Low Speed USB function. Communication speed is selected via the SPEED bit in SFR USB0XCN. When operating as a Low Speed function, the USB0 clock must ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.5. FIFO Management 1024 bytes of on-chip XRAM are used as FIFO space for USB0. This FIFO space is split between Endpoints0-3 as shown in Figure 16.3. FIFO space allocated for Endpoints1-3 is configurable as IN, OUT, or both ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.5.2. FIFO Double Buffering FIFO slots for Endpoints1-3 can be configured for double-buffered mode. In this mode, the maximum packet size is halved and the FIFO may contain two packets at a time. This mode is available for Endpoints1-3. ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.6. Function Addressing The FADDR register holds the current USB0 function address. Software should write the host-assigned 7-bit function address to the FADDR register when received as part of a SET_ADDRESS command. A new address written to FADDR will ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D “14. Oscillators” on page 131 for more details on internal oscillator configuration, including the Suspend mode feature of the internal oscillator. USB0 exits Suspend mode when any of the following occur: (1) Resume signaling is detected or gener- ated, ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.8. POWER: USB0 Power R/W R/W R/W ISOUD - - USBINH Bit7 Bit6 Bit5 Bit7: ISOUD: ISO Update This bit affects all IN Isochronous endpoints. 0: When software writes INPRDY = ‘1’, USB0 will send the ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.9. FRAMEL: USB0 Frame Number Low Bit7 Bit6 Bit5 Bits7-0: Frame Number Low This register contains bits7-0 of the last received frame number. USB Register Definition 16.10. FRAMEH: USB0 Frame Number High R ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.11. IN1INT: USB0 IN Endpoint Interrupt Bit7 Bit6 Bit5 Bits7–4: Unused. Read = 0000b. Write = don’t care. Bit3: IN3: IN Endpoint 3 Interrupt-pending Flag This bit is cleared when ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.13. CMINT: USB0 Common Interrupt Bit7 Bit6 Bit5 Bits7–4: Unused. Read = 0000b; Write = don’t care. Bit3: SOF: Start of Frame Interrupt Set by hardware when a SOF token ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.14. IN1IE: USB0 IN Endpoint Interrupt Enable R/W R/W R Bit7 Bit6 Bit5 Bits7–4: Unused. Read = 0000b. Write = don’t care. Bit3: IN3E: IN Endpoint 3 Interrupt Enable 0: IN Endpoint 3 ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.16. CMIE: USB0 Common Interrupt Enable R/W R/W R Bit7 Bit6 Bit5 Bits7–4: Unused. Read = 0000b; Write = don’t care. Bit3: SOFE: Start of Frame Interrupt Enable 0: SOF interrupt disabled. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D The E0CNT register (USB Register Definition 16.18) holds the number of received data bytes in the Endpoint0 FIFO. Hardware will automatically detect protocol errors and send a STALL condition in response. Firmware may force a STALL condition to abort ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 16.10.3.Endpoint0 OUT Transactions When a SETUP request is received that requires the host to transmit data to USB0, one or more OUT requests will be sent by the host. When an OUT packet is successfully received by USB0, hardware ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.17. E0CSR: USB0 Endpoint0 Control R/W R/W R/W SSUEND SOPRDY SDSTL SUEND DATAEND Bit7 Bit6 Bit5 Bit7: SSUEND: Serviced Setup End Write: Software should set this bit to ‘1’ after servicing a Setup End (bit SUEND) ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.18. E0CNT: USB0 Endpoint 0 Data Count Bit7 Bit6 Bit5 Bit7: Unused. Read = 0; Write = don’t care. Bits6–0: E0CNT: Endpoint 0 Data Count This 7-bit number indicates the number of ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Writing ‘1’ to INPRDY without writing any data to the endpoint FIFO will cause a zero-length packet to be transmitted upon reception of the next IN token. A Bulk or Interrupt pipe can be shut down (or Halted) by ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.19. EINCSRL: USB0 IN Endpoint Control Low Byte R W R/W - CLRDT STSTL Bit7 Bit6 Bit5 Bit7: Unused. Read = 0; Write = don’t care. Bit6: CLRDT: Clear Data Toggle. Write: Software should write ‘1’ ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.20. EINCSRH: USB0 IN Endpoint Control High Byte R/W R/W R/W DBIEN ISO DIRSEL Bit7 Bit6 Bit5 Bit7: DBIEN: IN Endpoint Double-buffer Enable. 0: Double-buffering disabled for the selected IN endpoint. 1: Double-buffering enabled for the ...

Page 184

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D A Bulk or Interrupt pipe can be shut down (or Halted) by writing ‘1’ to the SDSTL bit (EOUTCSRL.5). While SDSTL = ‘1’, hardware will respond to all OUT requests with a STALL condition. Each time hardware gen- erates ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.21. EOUTCSRL: USB0 OUT Endpoint Control Low Byte W R/W R/W CLRDT STSTL SDSTL Bit7 Bit6 Bit5 Bit7: CLRDT: Clear Data Toggle Write: Software should write ‘1’ to this bit to reset the OUT endpoint data ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D USB Register Definition 16.22. EOUTCSRH: USB0 OUT Endpoint Control High Byte R/W R/W R/W DBOEN ISO - Bit7 Bit6 Bit5 Bit7: DBOEN: Double-buffer Enable 0: Double-buffering disabled for the selected OUT endpoint. 1: Double-buffering enabled for the selected OUT ...

Page 187

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 16.4. USB Transceiver Electrical Characteristics V = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified DD Parameters Symbol Transmitter V Output High Voltage OH V Output Low Voltage OL V Output Crossover Point CRS Z ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17. SMBus The SMBus I/O interface is a two-wire, bi-directional serial bus. The SMBus is compliant with the System Management Bus Specification, version 1.1, and compatible with the I2C serial bus. Reads and writes to the interface by the ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.1. Supporting Documents It is assumed the reader is familiar with or has access to the following supporting documents: 1. The I2C-Bus and How to Use It (including specifications), Philips Semiconductor. 2. The I2C-Bus Specification -- Version 2.0, Philips ...

Page 190

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D The direction bit (R/W) occupies the least-significant bit position of the address byte. The direction bit is set to logic 1 to indicate a "READ" operation and cleared to logic 0 to indicate a "WRITE" operation. All transactions are ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.3.2. Clock Low Extension SMBus provides a clock synchronization mechanism, similar to I2C, which allows devices with different speed capabilities to coexist on the bus. A clock-low extension is used during a transfer in order to allow slower slave ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SMBus configuration options include: • Timeout detection (SCL Low Timeout and/or Bus Free Timeout) • SDA setup and hold time extensions • Slave event enable/disable • Clock source selection These options are selected in the SMB0CF register, as described ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Figure 17.4 shows the typical SCL generation described by Equation 17.2. Notice that T twice as large The actual SCL output may vary due to other devices on the bus (SCL may be LOW extended low ...

Page 194

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 17.1. SMB0CF: SMBus Clock/Configuration R/W R/W R ENSMB INH BUSY Bit7 Bit6 Bit5 Bit7: ENSMB: SMBus Enable. This bit enables/disables the SMBus interface. When enabled, the interface constantly mon- itors the SDA and SCL pins. 0: SMBus ...

Page 195

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.4.2. SMB0CN Control Register SMB0CN is used to control the interface and to provide status information (see SFR Definition 17.2). The higher four bits of SMB0CN (MASTER, TXMODE, STA, and STO) form a status vector that can be used ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D SFR Definition 17.2. SMB0CN: SMBus Control R R R/W MASTER TXMODE STA Bit7 Bit6 Bit5 Bit7: MASTER: SMBus Master/Slave Indicator. This read-only bit indicates when the SMBus is operating as a master. 0: SMBus operating in Slave Mode. 1: ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D Table 17.3. Sources for Hardware Changes to SMB0CN Bit Set by Hardware When: • A START is generated. MASTER • START is generated. • SMB0DAT is written before the start of an TXMODE SMBus frame. • A START followed ...

Page 198

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.4.3. Data Register The SMBus Data register SMB0DAT holds a byte of serial data to be transmitted or one that has just been received. Software may safely read or write to the data register when the SI flag is ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D S SLA W A Data Byte Interrupt Interrupt Received by SMBus Interface Transmitted by SMBus Interface Figure 17.5. Typical Master Transmitter Sequence Rev. 1.3 A Data Byte A P Interrupt Interrupt S = START P = STOP A = ...

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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D 17.5.2. Master Receiver Mode Serial data is received on SDA while the serial clock is output on SCL. The SMBus interface generates the START condition and transmits the first byte containing the address of the target slave and the ...

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