https://devzone.nordicsemi.com/f/nordic-q-a/48003/question-about-32mhz-high-frequency-clock-configurationHello, community. I have a question about hardware and software setting for using 32Mhz. (1) Software setting in sdk_config.h #ifndef CLOCK_ENABLED #define CLOCK_ENABLED 1 #endif #if CLOCK_ENABLED // &lt;o&gt; CLOCK_CONFIG_XTAL_FREQ - HF XTAL Frequencyen-USTelligent Community 13Mon, 03 Jun 2019 13:07:05 GMThttps://devzone.nordicsemi.com/thread/190528?ContentTypeID=1Mon, 03 Jun 2019 13:07:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4dac4d33-c49b-4b57-94e3-12f6abad0dceKenneth<p>Hi,</p> <p>There is an anomaly regarding using 32MHz that you should read:<br /><a href="https://infocenter.nordicsemi.com/pdf/nRF51822_pan_v3.3.pdf?cp=4_4_1_0">https://infocenter.nordicsemi.com/pdf/nRF51822_pan_v3.3.pdf?cp=4_4_1_0</a>&nbsp;</p> <p>The registers you are referring to I believe are related to the nRF52-series. In your case you have two ways of enable 32MHz:</p> <p>Either write to the XTALFREQ register in UICR (page 26 in reference manual), this way can be done during production programming.</p> <p>Or write to the XTALFREQ in the CLOCK peripheral (page 55 in reference manual)<span>, this way can be done during code execution in firmware.</span></p> <p><a href="https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf?cp=4_2_0">https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf?cp=4_2_0</a>&nbsp;</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>