STM32G4 and MCO pin

[Locnvselex_vn]

I am using STM32G431cbtx and enabling RCC_MCO. Since the STM32G4 supports two pins, PA8 and PG10, PA8 is being used for another function, and I am using PG10 for RCC_MCO. However, when measuring the voltage on pin PG10, it is always high.

Can anyone explain it to me?

[AScha.3]

Show, what you set in Cube ...

+

What frequency you want at mco ?

Set pin speed high ?

Scope probe at 10:1 ?

[Locnvselex_vn]

I have tested RCC_MCO on pin PA8 and it was successful. But when I tested it on PG10 (Reset Pin), it was always high

[AScha.3 · Accepted solution]

Ok,

so:

Did you set option bytes -> pg10 = not nrst, but alternate function (mco) ?

[Locnvselex_vn]

That's correct. However, the RCC_MCO signal still cannot be measured on PG10 pin!