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I2C speed mode is defined only by timing?

When I2C "Speed mode" changes in CubeMX/IDE from Standard to Fast, it seems that only the Init.Timing value changes in generated code.

This value goes into TIMINGR register of the I2C .

Am I missing anything or this value defines the "speed mode" entirely?

That's, the "speed mode" exists only in the Cube's GUI?

The chip is STM32H743/753

Thanks,

Pavel A

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Best answer by Piranha

In addition the SYSCFG_PMCR register has I2CxFMP and PBxFMP bits for Fast-mode plus (Fm+).

Super User

> Am I missing anything or this value defines the "speed mode" entirely?

I2C Fast -mode is defined in chapter 5.1 of the I2C specification.

JW

Yes, in the RM there are no other register bits related to the "speed mode", only the TIMINGR value.

-- pa

PiranhaBest answer

Principal III

In addition the SYSCFG_PMCR register has I2CxFMP and PBxFMP bits for Fast-mode plus (Fm+).

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