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STM8S 데이터시트(PDF) 315 Page - STMicroelectronics

부품명 STM8S
상세설명  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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STM8S 데이터시트(HTML) 315 Page - STMicroelectronics

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RM0016
Inter-integrated circuit (I2C) interface
319
21.7.11
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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