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RM0312 データシート(PDF) 196 Page - STMicroelectronics

部品番号 RM0312
部品情報  STM8TL5xxx microcontroller family
PDF  275 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0312 データシート(HTML) 196 Page - STMicroelectronics

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Inter-integrated circuit (I2C) interface
RM0312
196/275
DocID022352 Rev 3
19.7.12
Clock control register low (I2C_CCRL)
Address offset: 0x02
Reset value: 0x0B
7
654
3210
CCR[7:0]
rw
Bits 7:0 CCR[7:0] Clock control register (Master mode)
Controls the SCLH clock in Master mode.
– Standard mode:
Period(I2C) = 2 * CCR * tMASTER
thigh = CCR * tMASTER
tlow = CCR * tMASTER
– Fast mode:
If DUTY = 0:
Period(I2C) = 3* CCR * tMASTER
thigh = CCR * tMASTER
tlow = 2 * CCR * tMASTER
If DUTY = 1: (to reach 400 kHz)
Period(I2C) = 25 * CCR * tMASTER
thigh = 9 * CCR * tMASTER
tlow = 16 * CCR * tMASTER
Note: tCK = 1/ fMASTER. fMASTER is the input clock to the peripheral configured using clock control
register.
The minimum allowed value is 04h, except in FAST DUTY mode where the minimum allowed
value is 0x01.
thigh = tr(SCL) + tw(SCLH). See device datasheet for the definitions of parameters.
tlow = tf(SCL) + tw(SCLL). See device datasheet for the definitions of parameters.
I2C communication speed, fSCL = 1/(thigh + tlow)
The real frequency may differ due to the analog noise filter input delay.



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