https://devzone.nordicsemi.com/f/nordic-q-a/125840/case-about-nrf54l15-grtcHi, 1.I&#39;m attempting to create a GRTC wake-up example, but it&#39;s giving an error when running. Could you please help me troubleshoot this issue? 2. The line that caused the error is as follows: uint32_t waketime_cycles = LFCLK_FREQ_HZ / 2 ; // 约en-USTelligent Community 13Wed, 26 Nov 2025 12:06:15 GMThttps://devzone.nordicsemi.com/thread/555498?ContentTypeID=1Wed, 26 Nov 2025 12:06:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:05e5e0b6-4377-4a51-84d6-fbf55b80b8c6Vidar Berg<p>Hi,</p> <p>The assert at line 1967 in nrf_grtc.h (<a href="https://github.com/zephyrproject-rtos/hal_nordic/blob/7858281d843468fe53c829995fb63f45a227387a/nrfx/hal/nrf_grtc.h#L1967">https://github.com/zephyrproject-rtos/hal_nordic/blob/7858281d843468fe53c829995fb63f45a227387a/nrfx/hal/nrf_grtc.h#L1967</a>) is raised because you are exceeding the max. value for the WAKETIME register (Note: this register does not define the sleep duration). I recommend you use the&nbsp;z_nrf_grtc_wakeup_prepare() API instead as in our system_off sample here:&nbsp;<a href="https://github.com/nrfconnect/sdk-zephyr/blob/716d6a7b2ef73958d914d1f3377a95650689e71f/samples/boards/nordic/system_off/src/main.c#L105">https://github.com/nrfconnect/sdk-zephyr/blob/716d6a7b2ef73958d914d1f3377a95650689e71f/samples/boards/nordic/system_off/src/main.c#L105</a>. This ensures the GRTC gets configured correctly as a wakeup source for System OFF.</p> <p>Best regards,</p> <p>Vidar&nbsp;</p><div style="clear:both;"></div>