https://devzone.nordicsemi.com/f/nordic-q-a/128187/grtc-after-resetHi, I am developing an application for the nRF54L15 using NCS v3.2.4 , running entirely in the Secure domain . My goal is to maintain a continuous hardware system time that survives external hardware resets, specifically a Pin Reset , WDT reset en-USTelligent Community 13Wed, 20 May 2026 11:11:13 GMThttps://devzone.nordicsemi.com/thread/566594?ContentTypeID=1Wed, 20 May 2026 11:11:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:14e0e1d2-9758-477f-86fb-0f0f3182f3e7Vidar Berg<p>Hi,</p> <p>Unfortunately, the GRTC counter is only retained for the following reset sources:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1779275407136v1.png" alt=" " /></p> <p>(Ref. <a href="https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/chapters/power-and-clock/reset/doc/reset.html#ariaid-title11">https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/chapters/power-and-clock/reset/doc/reset.html#ariaid-title11</a>).</p> <p>So for timekeeping across hard resets I am afraid you will need an external RTC.</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>