C8051F021 Silicon Laboratories Inc, C8051F021 Datasheet - Page 23

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C8051F021

Manufacturer Part Number
C8051F021
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Datasheets

Specifications of C8051F021

Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
32
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-

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1.1.3. Additional Features
The C8051F020 MCU family includes several key enhancements to the CIP-51 core and peripherals to improve over-
all performance and ease of use in end applications.
The extended interrupt handler provides 22 interrupt sources into the CIP-51 (as opposed to 7 for the standard 8051),
allowing the numerous analog and digital peripherals to interrupt the controller. An interrupt driven system requires
less intervention by the MCU, giving it more effective throughput. The extra interrupt sources are very useful when
building multi-tasking, real-time systems.
There are up to seven reset sources for the MCU: an on-board VDD monitor, a Watchdog Timer, a missing clock
detector, a voltage level detection from Comparator0, a forced software reset, the CNVSTR input pin, and the /RST
pin. The /RST pin is bi-directional, accommodating an external reset, or allowing the internally generated POR to be
output on the /RST pin. Each reset source except for the VDD monitor and Reset Input pin may be disabled by the
user in software; the VDD monitor is enabled/disabled via the MONEN pin. The Watchdog Timer may be perma-
nently enabled in software after a power-on reset during MCU initialization.
The MCU has an internal, stand alone clock generator which is used by default as the system clock after any reset. If
desired, the clock source may be switched on the fly to the external oscillator, which can use a crystal, ceramic reso-
nator, capacitor, RC, or external clock source to generate the system clock. This can be extremely useful in low power
applications, allowing the MCU to run from a slow (power saving) external crystal source, while periodically switch-
ing to the fast (up to 16 MHz) internal oscillator as needed.
(Port
XTAL1
XTAL2
I/O)
CP0+
CP0-
Generator
Internal
Clock
Crossbar
OSC
Comparator0
CNVSTR
+
-
(CNVSTR
enable)
reset
Figure 1.6. On-Board Clock and Reset
enable)
(CP0
reset
Clock Select
System
Clock
Detector
Missing
Clock
(one-
shot)
Microcontroller
EN
Extended Interrupt
CIP-51
VDD
Core
Handler
EN
Rev. 1.4
WDT
PRE
Supply
Monitor
+
-
Software Reset
System Reset
Timeout
Supply
Reset
C8051F020/1/2/3
(wired-OR)
Reset
Funnel
/RST
23

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