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

[Bing]

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.

[Bing]

Hi Nordic, 

The problem has been sovled. The clock source HFINT and HFXO is automatically switched to reduce the power consumption when the softdevice is enabled. If I want to use the HFXO permanently, the API sd_clock_hfclk_request() should be used. And the API sd_clock_hfclk_release() can be used to restore the automatically switching mechanism.