PF1-OSC_OUT pin Loading

Forum|Forum|7 years ago
April 5, 2019
3 replies
1258 views

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

This topic has been closed for replies.

Best answer by Uwe Bonnes

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!

Uwe BonnesBest answer

Chief

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!

MEderAuthor

Associate III

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

Chief

The SIT1533A parts look nice.

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