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I2C config on STM32F446xx

Question asked by Laurent BOURDEL on Apr 12, 2018
Latest reply on Apr 12, 2018 by Imen D

I use Nucleo64 STM32F446RE


I want to configure I2C peripheral


In Reference Manuel RM0390 , §24.6.2 I2C Control register 2 (I2C_CR2), it's specified for Bits 5:0  FREQ[5:0]: Peripheral clock frequency :

"the maximum frequency is limited by the maximum APB frequency (42 MHz) and cannot exceed 50 MHz (peripheral intrinsic maximum limit)."


APB peripheral clock can be set up to 45Mhz for STM32F446xx, why is it specified 42Mhz max in I2C chapter ?


May be a mistake ?