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Issue with Clock Configuration for FK723M1-ZGT6 using an H723ZGT6 in CubeMX 6.12.1

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When I try setting up to use an external 10MHz reference clock on the HSE with a divisor of 1 and a multiplier of 25 it insist the frequency will be 255MHz but shouldn't it be 250MHz, Similarly for every multiplier I have tried the frequency is 5MHz off.

See attached screen shot from CubeMX.

Thanks

Chris.

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AScha.3Best answer

Super User

>it insist the frequency will be 255MHz but shouldn't it be 250MHz

Maybe - its right ? Because you set the fractional divider ....set it to zero, then try again.

btw

You set 4096 , so it gives F= Fref x (divn + 0,5 ); with Fref 10MHz, you get 5 MHz "added" .

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AScha.3Best answer

Super User

>it insist the frequency will be 255MHz but shouldn't it be 250MHz

Maybe - its right ? Because you set the fractional divider ....set it to zero, then try again.

btw

You set 4096 , so it gives F= Fref x (divn + 0,5 ); with Fref 10MHz, you get 5 MHz "added" .

If you feel a post has answered your question, please click on " Best Answer ".

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That was it thanks. Didn't realize that was a parameter I could change. I started it with 0 and some point I guess it had changed it.

Guru

Doesn't it have a 25 MHz crystal?

https://community.st.com/ysqtg83639/attachments/ysqtg83639/mcu-boards-hardware-tools-forum/18174/1/FK723M1-ZGT6-Schematic.pdf

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Associate

Changed it to external 10MHz reference.