https://devzone.nordicsemi.com/f/nordic-q-a/72490/how-to-check-the-presence-of-32-768-khz-crystalHi all I have developed a project on the nRF51-DK board based on the proprietary RF protocol. Now I have a custom PCB board always with an nRF51822 but only equipped with a 16MHz crystal. I would like to distinguish between nrf51-dk and my customen-USTelligent Community 13Mon, 08 Mar 2021 15:51:24 GMThttps://devzone.nordicsemi.com/thread/298465?ContentTypeID=1Mon, 08 Mar 2021 15:51:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:57754fa6-7265-4086-8868-281afbb9f1f9cristian.anceschi<p>Many thanks Kenneth.</p> <p>The code, reported on the link you send, works properly for me.</p> <p>Many thanks for your support</p> <p>Kind regards</p> <p>Cristian</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/298382?ContentTypeID=1Mon, 08 Mar 2021 13:12:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1174515-c1ff-49ac-962f-542fa9a2b0f5Kenneth<p>Something like this should work:<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/56844/in-our-product-we-would-like-to-select-lfclk-from-the-following-choices-instead-of-external-xtal-however-we-have-some-manufacturing-issues-with-the-xtal-chosen-and-so-we-muct-use-the-lf_src-to-be-the-rc/231321#231321">https://devzone.nordicsemi.com/f/nordic-q-a/56844/in-our-product-we-would-like-to-select-lfclk-from-the-following-choices-instead-of-external-xtal-however-we-have-some-manufacturing-issues-with-the-xtal-chosen-and-so-we-muct-use-the-lf_src-to-be-the-rc/231321#231321</a>&nbsp;</p><div style="clear:both;"></div>