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Detect whether HFXO or HFINT is clocking the HFCLK Controller?

nRF52840, SDK 16.0.0, SD132v7.0.1

What's the correct way to tell whether HFXO or HFINT is clocking the HFCLK controller? I'm able to start and stop the HFCLK controller, but how do I find out whether the crystal or internal oscillator is clocking it?

Thanks,

Charles

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