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STM8S bảng dữ liệu(PDF) 307 Page - STMicroelectronics

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RM0016
Inter-integrated circuit (I2C) interface
319
Note:
When STOP or START is set, the user must not perform any write access to I2C_CR2
before the control bit is cleared by hardware. Otherwise, a second STOP or START request
may occur.
21.7.3
Frequency register (I2C_FREQR)
Address offset: 0x02
Reset value: 0x00
7
654
3210
Reserved
FREQ[5:0]
r
rw
Bits 7:6 Reserved
Bits 5:0 FREQ[5:0] Peripheral clock frequency. (1)
The FREQ field is used by the peripheral to generate data setup and hold times compliant with the
I2C specifications. The FREQ bits must be programmed with the peripheral input clock frequency
value:
The allowed range is between 1 MHz and 24 MHz
000000: not allowed
000001: 1 MHz
000010: 2 MHz
...
011000: 24 MHz
Higher values: not allowed
1. The minimum peripheral clock frequencies for respecting the I2C bus timings are:
1 MHz for standard mode and 4 MHz for fast mode



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