https://devzone.nordicsemi.com/f/nordic-q-a/49635/how-to-configure-the-softdevice-clock-and-the-rtc-clockDear All, I am trying to use the external crystal as the source clock of the softdevice, as well as of the rtc. I am not sure if all this is possible and because I am new to it, I would appreciate any detailed explanation. What I have at the momenten-USTelligent Community 13Thu, 11 Jul 2019 11:24:39 GMThttps://devzone.nordicsemi.com/thread/197811?ContentTypeID=1Thu, 11 Jul 2019 11:24:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c58f18c7-fe14-4bb3-a6cd-2dbfbb162b37Vidar Berg<p>Yes,&nbsp;<span>NRF_SDH_CLOCK_LF_RC_CTIV and&nbsp;NRF_SDH_CLOCK_LF_RC_TEMP_CTIV must be set &#39;0&#39; when&nbsp;have selected the XTAL, they&#39;re not ignored as one might expect. You should also set&nbsp;NRF_SDH_CLOCK_LF_ACCURACY to a PPM value appropriate for your crystal in order to reduce power consumption (Softdevice use longer rx windows to account for clock drift).&nbsp;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/197783?ContentTypeID=1Thu, 11 Jul 2019 10:22:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:973f20f1-57dd-444f-9426-9f6aefbeca62sewes<p>Error code 7 means in this case NRF_ERROR_INVALID_PARAM.</p> <p>Something is wrong with your configuration.</p> <p>Please check if the values for NRF_SDH_CLOCK_LF_RC_CTIV and NRF_SDH_CLOCK_LF_RC_TEMP_CTIV are set correctly.</p> <p>I would suggest you to set these values to 0 and test again.</p><div style="clear:both;"></div>