https://devzone.nordicsemi.com/f/nordic-q-a/36466/how-to-enter-sys-on-low-power-mode-on-nrf52-series-and-wake-up-by-rtcHello, we want to evaluate the nRF52832 chip with a example project. This project has the following functions: - low power - system wakeup by RTC running with external 32 kHz crystal - while in idle or sleep 64 k RAM retention - when RTC wakesen-USTelligent Community 13Tue, 17 Jul 2018 12:00:16 GMThttps://devzone.nordicsemi.com/thread/140383?ContentTypeID=1Tue, 17 Jul 2018 12:00:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:463df0b8-45e9-489a-9e4c-99e81a8e6de8haakonsh<p>See&nbsp;<a title="nrf_pwr_mgmt_run" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/group__nrf__pwr__mgmt.html?cp=4_0_0_6_11_38_7#ga4ed9cb21c98d64130c12eb8490821673">nrf_pwr_mgmt_run</a>&nbsp;API docs. It puts the system into SystemON by running the following three lines of code after doing some graceful shutdown stuff:<br />__WFE;<br />__SEV;<br />__WFE;<br /><br />Any interrupt or peripheral EVENT will wake up the CPU, you can therefore set up the RTC to fire a COMPARE MATCH EVENT after 3s with the RTC example in SDK15\examples\peripheral\rtc, or by using the <a title="Application Timer" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/group__app__timer.html?cp=4_0_0_6_11_54">Application Timer</a> library.&nbsp;<br /><br />RAM is always retained in SystemON sleep, see&nbsp;<a title="nrf_power_rampower_mask_on" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/group__nrf__power__hal.html?cp=4_0_0_6_9_0_10_2_39#ga8ef9745ad414a8b9c8dd1f21de885b07">nrf_power_rampower_mask_on</a>&nbsp;to set the RAM retention if you&#39;re going into SystemOff.&nbsp;<br /><br /></p><div style="clear:both;"></div>