https://devzone.nordicsemi.com/f/nordic-q-a/115128/relation-between-clock-and-softdeviceI&#39;am currently porting code from NRF51822 to NRF52805. In my old code I used the following line to initialize softdevice: ``` SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL); ``` I&#39;m not sure if parameter `NRF_CLOCK_LFCLKSRC_XTAL_20_PPMen-USTelligent Community 13Tue, 01 Oct 2024 12:07:35 GMThttps://devzone.nordicsemi.com/thread/504519?ContentTypeID=1Tue, 01 Oct 2024 12:07:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a4bbd4e-f265-4aaf-a146-7d360c12cc00Hung Bui<p>Hi Johannes,&nbsp;<br />First of all the nRF5 SDK is&nbsp;maintenance mode as we moved to nRF Connect SDK since 2020. For any new development we suggest to use nRF Connect SDK.<br /><br />Regarding your question, to set the LF clock you would need to looking to the sdkconfig.h file. Please look for&nbsp;<br />NRF_SDH_CLOCK_LF_SRC . Set it to 1 mean XTAL and 0 means RC. Please don&#39;t use <span>NRF_CLOCK_LF_SRC_SYNTH&nbsp;</span>because it&#39;s not tested for use with the softdevice.&nbsp;</p> <p>You may need to check if&nbsp;NRFX_CLOCK_CONFIG_LF_SRC and&nbsp;CLOCK_CONFIG_LF_SRC are set to the same clock source or not.&nbsp;</p><div style="clear:both;"></div>