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NRF52832 use the external 32MHz crystal as the source of HFCLK

HI Nordic,

I want to know whether the NRF52832 use the RC oscillator as the default source of HFCLK . I want to use the TIMER peripheral to do a precise duration measurement. But I don't know the root clock source of the PCLK16M. If it is the internal 64MHz RC oscillator, is there any setting entrance to use external 32MHz crystal as the root source of HFCLK? If existed, how to set?

Thanks for any replay.

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