C8051F131R Silicon Labs, C8051F131R Datasheet - Page 267
C8051F131R
Manufacturer Part Number
C8051F131R
Description
8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
Manufacturer
Silicon Labs
Datasheet
1.C8051F133R.pdf
(350 pages)
Specifications of C8051F131R
Product Category
8-bit Microcontrollers - MCU
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
100 MHz
Program Memory Size
128 KB
Data Ram Size
8.25 KB
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 3.6 V
Package / Case
TQFP-64
Mounting Style
SMD/SMT
A/d Bit Size
10 bit
A/d Channels Available
9
Data Rom Size
64 KB
Interface Type
I2C, SMBus, SPI, UART
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
32
Number Of Timers
16 bit
Processor Series
C8051
Program Memory Type
Flash
Factory Pack Quantity
500
Supply Voltage - Max
3.6 V
Supply Voltage - Min
3 V
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19.4.2. Clock Rate Register
Bits7–0: SMB0CR.[7:0]: SMBus0 Clock Rate Preset
R/W
Bit7
The SMB0CR Clock Rate register controls the frequency of the serial clock SCL in master
mode. The 8-bit word stored in the SMB0CR Register preloads a dedicated 8-bit timer. The
timer counts up, and when it rolls over to 0x00, the SCL logic state toggles.
The SMB0CR setting should be bounded by the following equation , where SMB0CR is the
unsigned 8-bit value in register SMB0CR, and SYSCLK is the system clock frequency in
MHz:
The resulting SCL signal high and low times are given by the following equations, where
SYSCLK is the system clock frequency in Hz:
Using the same value of SMB0CR from above, the Bus Free Timeout period is given in the
following equation:
R/W
Bit6
SFR Definition 19.2. SMB0CR: SMBus0 Clock Rate
SMB0CR
T
HIGH
R/W
Bit5
T
LOW
T
BFT
4
=
288 0.85
10
R/W
Bit4
4
258 SMB0CR
–
–
256 SMB0CR
4
------------------------------------------------------------- -
Rev. 1.4
–
256 SMB0CR
R/W
Bit3
SYSCLK
--------------------- -
SYSCLK
–
C8051F120/1/2/3/4/5/6/7
4
SYSCLK
R/W
Bit2
1.125
SYSCLK
+
C8051F130/1/2/3
+
1
625ns
R/W
Bit1
SFR Address:
SFR Page:
R/W
Bit0
0xCF
0
00000000
Reset Value
267
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