https://devzone.nordicsemi.com/f/nordic-q-a/43513/rtc-counter-is-not-runningI plan to use RTC for a simple counter. No need for interrupt nor event. I don&#39;t use SoftDevice. It&#39;s 52840. I just need to set it to run, and periodically read the counter. No need to detect overflow, just need to let it wrap around. Below is myen-USTelligent Community 13Mon, 11 Feb 2019 21:31:52 GMThttps://devzone.nordicsemi.com/thread/170467?ContentTypeID=1Mon, 11 Feb 2019 21:31:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:251fc2fd-34d9-4702-b7a0-7b3ead8893d1Harry<p>Thanks a lot, yes, it&#39;s configuration issue. I found that the internal RC wasn&#39;t running. It&#39;s works OK now.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/170227?ContentTypeID=1Sun, 10 Feb 2019 02:56:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b637d7aa-c5e4-40d5-a487-162590e824cbHarry<p>Good point, I will verify it on Monday. I thought the internal RC had been initialized and enabled by the init module.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/170219?ContentTypeID=1Sat, 09 Feb 2019 15:37:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:00669d5a-0b47-4ec2-a149-4bd6036be379Nguyen Hoan Hoang<p>Have you enabled the clock source ? Either crystal or RC</p><div style="clear:both;"></div>