NRF52832 use the external 32MHz crystal as the source of HFCLKhttps://devzone.nordicsemi.com/f/nordic-q-a/33406/nrf52832-use-the-external-32mhz-crystal-as-the-source-of-hfclkHI 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&#39;t know the root clock source of the PCLK16M. If it is the internalen-USTelligent Community 13Sun, 15 Apr 2018 03:24:57 GMTRE: NRF52832 use the external 32MHz crystal as the source of HFCLKhttps://devzone.nordicsemi.com/thread/128348?ContentTypeID=1Sun, 15 Apr 2018 03:24:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f17bee0a-8ac0-43f7-af6b-644f06a9b6cdBing<p>Hi Nordic,&nbsp;</p> <p>The problem has been sovled. The clock source HFINT and HFXO is automatically switched to&nbsp;reduce the power consumption when the softdevice is enabled. If I want to use the HFXO permanently, the&nbsp;API sd_clock_hfclk_request() should be used. And the API sd_clock_hfclk_release() can be used to restore the automatically switching mechanism.&nbsp;</p><div style="clear:both;"></div>