PF1-OSC_OUT pin Loading

[MEder]

I want to connect the PF1-OSC_OUT ​pin to another circuit on my board, to use this 32.768kHz clock for another counter. ( instead of adding another crystal )

Would this be a problem?  I can buffer it to minimize pulling the crystal. Any suggestions?

(I've never attempted this on a STM32 part)

Thanks

[Uwe Bonnes · Accepted solution]

Yes, that is a problem. There is no loading allowed on the OSC pin beside the crystal and the loading capacitors. Waveforms are also far from "digital". Route LSE to MCO!

[MEder]

​Thanks for the pointer. Neat feature, But MCOSEL is reset to 0000 0000, resulting in no clock out at reset. Unfortunately this does not work for me. ( I need a clock regardless of system reset)

I'll just add another crystal or resonator.

Thanks

[Uwe Bonnes]

The SIT1533A parts look nice.