https://devzone.nordicsemi.com/f/nordic-q-a/34614/how-to-know-mcu-wake-up-reasonHello, I am using sd_power_system_off(); sfunction to put the MCU in sleep mode. I have to wake up events. One is NFC and the other is GPIO. Both wake up functions works well but I need to know that which one occurs When the MCU wakes up from sleepen-USTelligent Community 13Thu, 31 May 2018 12:39:26 GMThttps://devzone.nordicsemi.com/thread/134179?ContentTypeID=1Thu, 31 May 2018 12:39:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e23d17c-156a-4b66-a726-89a4cd0edef5haakonsh<p>Hey enkavak,<br /><br /></p> <p>Sorry for the late reply. Can you reproduce this issue on the nRF52DK?&nbsp;</p> <p>Cheers,</p> <p>Håkon.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/132686?ContentTypeID=1Tue, 22 May 2018 08:52:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52e6d89e-03a8-4e21-bbbf-2fa3bf9f86a8enkavak<p>I found a topic Which explains the reset reason by using the code below. However, I get&nbsp;<strong>0x00000001&nbsp;</strong>every time MCU wakes up. GPIO or NCF is does not matter. Whatever the reason is I get the same output.</p> <p></p> <pre><code>reset_reason = NRF_POWER-&gt;RESETREAS; NRF_LOG_PRINTF(&quot;reset_reason: 0x%08x.\n&quot;,reset_reason );</code></pre><div style="clear:both;"></div>