RM0016 datasheet(307/467 Pages) STMICROELECTRONICS

Part #	RM0016

Description	STM8S Series and STM8AF Series 8-bit microcontrollers

PDF	467 Pages

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Manufacturer	STMICROELECTRONICS [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

654

3210

Reserved

FREQ[5:0]

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

RM0016 Datasheet(PDF) 307 Page - STMicroelectronics