https://devzone.nordicsemi.com/f/nordic-q-a/83835/rtc1-runs-too-fastGreetings, I am developing an application for the NRF52840 in a RAK Wireless RAK4631, using the Arduino BlueFruit libraries. When I monitor NRF_RTC1-&gt;COUNTER variable, it seems to increment too fast - approximately 2000ms are gained every minute whenen-USTelligent Community 13Thu, 20 Jan 2022 08:34:29 GMThttps://devzone.nordicsemi.com/thread/348640?ContentTypeID=1Thu, 20 Jan 2022 08:34:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:377d4bcf-2e6c-43ee-a124-5eb28583e5a0Karl Ylvisaker<p>Hello Ryan,<br /><br />I am glad to see that you identified the issue so quickly!<br />Yes, the COUNTER register will increment each RTC tick, which is not given in milliseconds, and also dependent on the prescaler configuration.<br /><br />Please do not hesitate to open another ticket if you should encounter any issues or questions in the future.<br /><br />Good luck with your development!<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/348575?ContentTypeID=1Wed, 19 Jan 2022 17:08:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f829e1ea-afe7-4dd5-8b75-a036f0b4ed2ergriggs<p>Please disregard my question: I just realized that the RTC-&gt;COUNTER is NOT milliseconds and must be divided by 1024 instead of 1000 to get accurate seconds.</p><div style="clear:both;"></div>