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PF1-OSC_OUT pin Loading

MEder
Associate III

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

1 ACCEPTED SOLUTION

Accepted Solutions
Uwe Bonnes
Principal III

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!

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3 REPLIES 3
Uwe Bonnes
Principal III

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!

​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
Principal III