If i used the STM32H743 at 480 and the AHB bus at 240. will i be able to use the DCMI pixel clock at 96Mhz or its not possible at its fixed to 80Mhz even if the processor runs at 480Mhz

[MSale.1]

I have asked this question before and got no answer from STM so its better to clear it for us so we know

[Imen.D]

Hello @Community member​ ,

According to the STM32H743 datahseet: max clock for DCMI is 80MHz. this data is the result of characterization.

Hope this answer your question.

Please select the post as a "Best Answer" if it answers your question.

Thanks

Imen

[MSale.1]

@Imen DAHMEN​ 

Hi

In the datasheet its mentioned 80Mhz at 400Mhz. so even at 480Mhz the max will still be 80Mhz or 96Mhz?

[CKUND.1]

The reference manual says on page 1187 (DCMI Clocks): "The maximum DCMI_PIXCLK period must be higher than 2.5 HCLK periods."

So, if AHB clock is 240 MHz / 96Mhz = 2.5

Maybe is possible to work, but you are trying to use the DCMI interface in the max clock possible. I don't know if is a good ideia!

Best Regards,

Kunde