https://devzone.nordicsemi.com/f/nordic-q-a/31047/rtHi,nrf52832 RTC module don&#39;t support calendar? How to keep calendar when the device is reboot?en-USTelligent Community 13Fri, 02 Mar 2018 08:44:54 GMThttps://devzone.nordicsemi.com/thread/122565?ContentTypeID=1Fri, 02 Mar 2018 08:44:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3850a10e-3c24-4316-86d8-ab278a573919pyz<p>Thank you</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/122563?ContentTypeID=1Fri, 02 Mar 2018 08:40:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbaa76b0-6f9c-4705-8f07-92da1fa573c2J&#248;rgen Holmefjord<p>Hi,</p> <p>The RTC in nRF52832 is a <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/rtc.html?cp=2_1_0_24#concept_rvn_vkj_sr">Real-Time Counter</a>, not a Real-Time Clock. It is possible to keep track of time using the counter, but it does not support calendard or high presision timing. It is just a low-power timer running of the 32.768 kHz low frequency clock. The timer will not run when the chip is in <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=2_1_0_17_1#unique_1707892264">system off low power mode</a> or retain any data during reset.</p> <p>If you need real-time clock, you will have to add an external chip handling this.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>