https://devzone.nordicsemi.com/f/nordic-q-a/80412/nrf52810---can-the-clock-time-be-reducedNordic nRF52810 requires 32 MHz external crystal, but the tolerances are defined only for wireless application (which we do not plan to use). We want to use this CPU only to handle alarm (Led and sound only - without any complex operation or hard calculationsen-USTelligent Community 13Thu, 07 Oct 2021 12:57:28 GMThttps://devzone.nordicsemi.com/thread/333061?ContentTypeID=1Thu, 07 Oct 2021 12:57:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d720551c-b258-4280-8ee5-c43a94781076ketiljo<p>No, this is not possible. The PLL that generates the CPU clock doesn&#39;t operate on anything but with a 32 MHz crystal.</p><div style="clear:both;"></div>