About SCLK frequency for SPI communication

[pass3master]

About SCLK frequency for SPI communication

We are trying to set 40MHz for SCLK.
What is the maximum SCLK frequency we can set?
Is there an upper limit depending on the microcontroller?

[KDJEM.1 · Accepted solution]

Hello @pass3master,

Do you mean SPI clock frequency by "SCLK"?

The fSCK clock frequency depends on some conditions like as mode, VDD, and STM32H7 revision. 

For example, for the STM32H743 revY, fSCK max is as shown in the below figure

For the STM32H743 revV, fSCK max is as shown in the below figure

For more information about the conditions and the maximum SPI clock frequency, I recommend you to look to the datasheet SPI interface characteristics section.

Please let me know if my reply answers your request or not?

Thank you for your contribution to the community.

Kaouthar

[pass3master]

Thanks for the answer. Sorry for the lack of explanation, SCLK stands for SPI clk. Now that I know where to look on the datasheet, I will close it.