参数资料
型号: ST72T85A5Q6
厂商: 意法半导体
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000铁路发展策略光盘,3K内存,ADC,两个定时器,2个SPI,I2C和脊髓损伤接口
文件页数: 57/117页
文件大小: 748K
代理商: ST72T85A5Q6
57/117
ST7285C
I
2
C BUS INTERFACE
(Cont’d)
4.5.5 Register Description
CLOCK CONTROL REGISTER (CCR)
Address: 002Bh
Reset Value: 00h
Read / Write
b7:
FM/SM
Fast / Standard I
2
C mode
When the bit is set to 1 the interface operates in
the fast I
2
C bus mode.
When the bit is set to 0 the interface operates in
the standard I
2
C bus mode.
b6-0:
D6-D0
7 bit divider programming
Implementation of a programmable clock divider
In Standard I
2
C mode:
Fscl = PHI1/(2x([D6..D0]+2)); in this case, Fscl
varies
between
15.75KHz and 100
PHI1=4MHz).
In Fast I
2
C mode:
Fscl = PHI1/(3x([D6..D0]+2)); in this case, Fscl
varies
between
10.5
PHI1=4MHz).
KHz (if
KHz
and
333KHz
(if
Table 8. Example of SCL frequency with PHI1 = 4 MHz in Standard I
2
C mode
7
0
FM/SM
CC6
CC5
CC4
CC3
CC2
CC1
CC0
FM/SM
0
0
0
0
0
1
1
1
1
1
1
D6
0
0
0
1
1
0
0
0
0
0
1
D5
0
0
1
0
1
0
0
0
0
0
1
D4
1
1
0
0
1
0
0
0
0
1
1
D3
0
1
0
1
1
0
0
0
1
1
1
D2
0
0
1
1
1
0
1
1
1
0
1
D1
1
1
1
1
1
1
0
1
0
1
1
D0
0
1
0
0
1
0
1
0
1
1
1
Fscl(Khz)
100
70
50
25
15.75
333
190
167
89
43
10.5
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