https://devzone.nordicsemi.com/f/nordic-q-a/127293/nrf54l15-syscounter-synchronization-with-lfxoHi, We&#39;re using the nRF54L15 driven by a 5ppm TCXO connected to the LFCLK. Our application measures the timing external pin events; the accuracy of this measurement is critical. We&#39;d like these measurements to be timed by our TCXO. It seems the TIMERen-USTelligent Community 13Fri, 06 Mar 2026 13:45:47 GMThttps://devzone.nordicsemi.com/thread/562733?ContentTypeID=1Fri, 06 Mar 2026 13:45:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f7ee8b0d-cb34-4cb9-8f98-26a749bc8a4ammdunc<p>Thanks for the quick reply, and glad to hear the GRTC is calibrated towards LFCLK on every LFCLK tick. This alleviates our accuracy concern.<br /><br />Regarding the power consumption spikes I reported, upon further inspection it seems these were red herrings and not related to the synchronization.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/562688?ContentTypeID=1Thu, 05 Mar 2026 22:13:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0a117d2d-d28d-4e6f-83af-fa9a58b9859bEmil Lenngren<p>Please see my reply here:&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/122953/grtc-periodic-interval-nrfx/550745">RE: GRTC Periodic interval + nrfx</a>&nbsp;</p> <p>That is based on an experiment where I have set up a DPPI event from GRTC to a TIMER instance, running at 16 MHz, to capture the TIMER time every GRTC tick and observing the result. To get it drifting, I vary the temperature by putting the devkit into a freezer.</p><div style="clear:both;"></div>