参数资料
型号: ST72F652R4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 18/160页
文件大小: 974K
代理商: ST72F652R4T1
ST7265
114/160
I C SINGLE MASTER 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 = CC6-CC0
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 = D7-D0
8-bit Data Register.
These bits contains the byte to be received or
transmitted 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 next data bytes are received one by
one after reading the DR register.
Table 31. I2C Register Map
70
FM/SM
CC6
CC5
CC4
CC3
CC2
CC1
CC0
70
D7
D6
D5
D4
D3
D2
D1
D0
Address
(Hex.)
Register
Name
765
4
3210
40
CR
Reset Value
0
PE
00
START
0
ACK
0
STOP
0
ITE
0
41
SR1
Reset Value
EVF
00
TRA
0
BUSY
0
BTF
00
M/IDL
0
SB
0
42
SR2
Reset Value
0
AF
00
0
BERR
00
43
CCR
Reset Value
FM/SM
0
CC6
0
CC5
0
CC4
0
CC3
0
CC2
0
CC1
0
CC0
0
46
DR
Reset Value
DR7
0
DR6
0
DR5
0
DR4
0
DR3
0
DR2
0
DR1
0
DR0
0
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