参数资料
型号: ST72P589BW5/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP128
封装: 14 X 20 MM, PLASTIC, QFP-128
文件页数: 12/158页
文件大小: 2192K
代理商: ST72P589BW5/XXX
ST72589BW, ST72389BW
109/158
I2C BUS INTERFACE (Cont’d)
I2C CLOCK CONTROL REGISTER (CCR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7 = FM/SM Fast/Standard I2C mode.
This bit is set and cleared by software. It is not
cleared when the interface is disabled (PE=0).
0: Standard I2C mode
1: Fast I2C mode
Bit 6:0 = CC[6:0] 7-bit clock divider.
These bits select the speed of the bus (FSCL) de-
pending on the I2C mode. They are not cleared
when the interface is disabled (PE=0).
– Standard mode (FM/SM=0): FSCL <= 100kHz
FSCL = FCPU/(2x([CC6..CC0]+2))
– Fast mode (FM/SM=1): FSCL > 100kHz
FSCL = FCPU/(3x([CC6..CC0]+2))
Note: The programmed FSCL assumes no load on
SCL and SDA lines.
I2C DATA REGISTER (DR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D[7:0] 8-bit Data Register.
These bits contain the byte to be received or trans-
mitted on the bus.
– Transmitter mode: Byte transmission start auto-
matically when the software writes in the DR reg-
ister.
– Receiver mode: the first data byte is received au-
tomatically in the DR register using the least sig-
nificant bit of the address.
Then, the following data bytes are received one
by one after reading the DR register.
70
FM/SM
CC6
CC5
CC4
CC3
CC2
CC1
CC0
70
D7
D6
D5
D4
D3
D2
D1
D0
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