Can the nRF52840 use other clock frequencies than 64 or 32 MHz?https://devzone.nordicsemi.com/f/nordic-q-a/22760/can-the-nrf52840-use-other-clock-frequencies-than-64-or-32-mhzI&#39;d like to clock the nRF52840 at the same frequency as my converters. Is there any problem with using a somewhat different frequency than the 64 MHz (or 32mhZ) crystal? If it is OK, what is the permissible frequency range?en-USTelligent Community 13Tue, 13 Jun 2017 19:26:02 GMTRE: Can the nRF52840 use other clock frequencies than 64 or 32 MHz?https://devzone.nordicsemi.com/thread/89477?ContentTypeID=1Tue, 13 Jun 2017 19:26:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8a101c32-16b2-4fae-8125-638640da19c5Turbo J<p>The radio will only work with the correct crystal.</p> <p>If you don&#39;t need the radio, you would be better off using a different chip. The crystal oscillator is tailored not just for the specified frequency but also for a rather fast startup time &lt;1ms. This usually results in a very narrow range of allowed crystal frequencies.</p> <p>Oh, and switching from the internal 64 MHz RCO to the crystal based osc and back would more likely produce glitches that can cause various errors - even if you get the crystal running.</p><div style="clear:both;"></div>RE: Can the nRF52840 use other clock frequencies than 64 or 32 MHz?https://devzone.nordicsemi.com/thread/89478?ContentTypeID=1Tue, 13 Jun 2017 19:19:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32691c93-4a15-47c5-8abc-5828a040fb8aendnode<p><a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/clock.html?cp=2_1_0_16_0#concept_rp5_fgp_bs">nRF52840 specification is clear</a>: similar to all other nRF5x chips only specific high-frequency clock source is possible (and required if you want to use 2.4GHz radio interface). In case of nRF52840 it is 64MHz crystal.</p><div style="clear:both;"></div>