C8051F021-GQ Silicon Laboratories Inc, C8051F021-GQ Datasheet - Page 194

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
18.4.5. Status Register
The SMB0STA Status register holds an 8-bit status code indicating the current state of the SMBus0 interface. There
are 28 possible SMBus0 states, each with a corresponding unique status code. The five most significant bits of the
status code vary while the three least-significant bits of a valid status code are fixed at zero when SI = ‘1’. Therefore,
all possible status codes are multiples of eight. This facilitates the use of status codes in software as an index used to
branch to appropriate service routines (allowing 8 bytes of code to service the state or jump to a more extensive ser-
vice routine).
For the purposes of user software, the contents of the SMB0STA register is only defined when the SI flag is logic 1.
Software should never write to the SMB0STA register; doing so will yield indeterminate results. The 28 SMBus0
states, along with their corresponding status codes, are given in Table 1.1.
194
Bits7-3:
Bits2-0:
STA7
R/W
Bit7
STA7-STA3: SMBus0 Status Code.
These bits contain the SMBus0 Status Code. There are 28 possible status codes; each status code cor-
responds to a single SMBus state. A valid status code is present in SMB0STA when the SI flag
(SMB0CN.3) is set to logic 1. The content of SMB0STA is not defined when the SI flag is logic 0.
Writing to the SMB0STA register at any time will yield indeterminate results.
STA2-STA0: The three least significant bits of SMB0STA are always read as logic 0 when the SI flag
is logic 1.
STA6
R/W
Bit6
Figure 18.12. SMB0STA: SMBus0 Status Register
STA5
R/W
Bit5
STA4
R/W
Bit4
Rev. 1.4
STA3
R/W
Bit3
STA2
R/W
Bit2
STA1
R/W
Bit1
STA0
R/W
Bit0
SFR Address:
00000000
Reset Value
0xC1

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