https://devzone.nordicsemi.com/f/nordic-q-a/60049/configure-system-clock-faster-than-32768hz-in-ncs-zephyrIt looks to me that in NCS/Zephyr it is only possible to configure the system clock to operate off of the LFCLK. I haven&#39;t been able to find any Kconfig options that would make the HFCLK the source of the clock. It is very important to our applicationen-USTelligent Community 13Tue, 14 Apr 2020 10:48:28 GMThttps://devzone.nordicsemi.com/thread/244400?ContentTypeID=1Tue, 14 Apr 2020 10:48:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f9c57d9d-ea79-4081-9773-a71fbc6f9a97H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>Timing in zephyr rtos kernel runs off the 32.768 kHz RTC, as you have already found out. There is no backend for NRF_TIMERx, so in order to get a better resolution, you have to create a module using nrfx_timer driver for instance. Note that this will&nbsp;raise the base current from sub 10 uA to ~800 uA (HFXO, see <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/_tmp/graviton/autodita/CURRENT/parameters.i_timer.html?cp=4_0_0_4_1_0_8">these specifications</a>), as the high-speed NRF_TIMER peripheral will require the peripheral clock tree to run in sleep mode.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>