https://devzone.nordicsemi.com/f/nordic-q-a/123422/rtcx-fails-to-start-until-power-is-removedNew issue found, unsure if I can resolve this one! I have found the RTC1 may on rare occasion lock up, no love of resets, playing with LFSRC or RTC registers will make it count. What will rectify the situation is if power is completely removed from theen-USTelligent Community 13Sat, 02 Aug 2025 19:37:59 GMThttps://devzone.nordicsemi.com/thread/544393?ContentTypeID=1Sat, 02 Aug 2025 19:37:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e93f9812-a7de-4cd2-95eb-d667172f6639snoopy20<p>Very nice, I&#39;ll try it for sure!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/544391?ContentTypeID=1Sat, 02 Aug 2025 17:52:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d4567c29-121a-4668-b15f-b13151a71377hmolesworth<p>This may work, worth a try; I tested his a while back (not officially documented):</p> <p><pre class="ui-code" data-mode="c_cpp"> // Power off *(volatile uint32_t *)( NRF_RTC1_BASE+0xFFC) = 0; // RTC1 Power Enable - turn off ... wait a bit // Power on *(volatile uint32_t *)( NRF_RTC1_BASE+0xFFC) = 1; // RTC1 Power Enable - turn on </pre></p><div style="clear:both;"></div>