C8051F021-GQ Silicon Laboratories Inc, C8051F021-GQ Datasheet - Page 128

IC 8051 MCU 64K FLASH 64TQFP

C8051F021-GQ

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

Specifications of C8051F021-GQ

Program Memory Type
FLASH
Program Memory Size
64KB (64K x 8)
Package / Case
64-TQFP, 64-VQFP
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
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
Processor Series
C8051F0x
Core
8051
Data Bus Width
8 bit
Data Ram Size
4.25 KB
Interface Type
I2C/SMBus/SPI/UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
32
Number Of Timers
4
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F020DK
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 8-bit or 8-ch x 12-bit
On-chip Dac
2-ch x 12-bit
No. Of I/o's
32
Ram Memory Size
4352Byte
Cpu Speed
25MHz
No. Of Timers
5
No. Of Pwm Channels
5
Rohs Compliant
Yes
Data Rom Size
64 KB
A/d Bit Size
12 bit
A/d Channels Available
8
Height
1.05 mm
Length
10 mm
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.7 V
Width
10 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1200 - DEV KIT FOR F020/F021/F022/F023
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1201

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C8051F020/1/2/3
13.1. Power-on Reset
The C8051F020/1/2/3 family incorporates a power supply monitor that holds the MCU in the reset state until VDD
rises above the V
trical Characteristics of the power supply monitor circuit. The /RST pin is asserted low until the end of the 100 ms
VDD Monitor timeout in order to allow the VDD supply to stabilize.
On exit from a power-on reset, the PORSF flag (RSTSRC.1) is set by hardware to logic 1. All of the other reset flags
in the RSTSRC Register are indeterminate. PORSF is cleared by all other resets. Since all resets cause program exe-
cution to begin at the same location (0x0000), software can read the PORSF flag to determine if a power-up was the
cause of reset. The contents of internal data memory should be assumed to be undefined after a power-on reset.
The VDD monitor function is enabled by tying the MONEN pin directly to VDD. This is the recommended
configuration for the MONEN pin.
.
13.2. Power-fail Reset
When a power-down transition or power irregularity causes VDD to drop below V
drive the /RST pin low and return the CIP-51 to the reset state. When VDD returns to a level above VRST, the CIP-51
will leave the reset state in the same manner as that for the power-on reset (see Figure 13.2). Note that even though
internal data memory contents are not altered by the power-fail reset, it is impossible to determine if VDD dropped
below the level required for data retention. If the PORSF flag is set to logic 1, the data may no longer be valid.
128
Logic HIGH
Logic LOW
2.70
2.55
RST
2.0
1.0
level during power-up. See Figure 13.2 for timing diagram, and refer to Table 13.1 for the Elec-
/RST
V
RST
Figure 13.2. Reset Timing
Power-On Reset
100ms
Rev. 1.4
VDD Monitor Reset
RST
, the power supply monitor will
100ms
t

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