https://devzone.nordicsemi.com/f/nordic-q-a/17063/wake-up-from-system-offHi All, my device wakeup from system off casued from reset RWOFF, I read the register RESETSRC and byte E is 1. maybe there is something about the configuration of gpio to go in sleep mode??en-USTelligent Community 13Mon, 17 Oct 2016 09:02:50 GMThttps://devzone.nordicsemi.com/thread/65446?ContentTypeID=1Mon, 17 Oct 2016 09:02:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1dcfbf8f-e168-4bf7-afb9-a79a40c59a77Ole Bauck<p>If byte E in RESETREAS is 1 it means you have woken up from system OFF triggered by GPIO. To do this one of the GPIO have to be configured with SENSE enabled (SENSE bit in NRF_GPIO-&gt;PIN_CNF[x] register) before entering system OFF.</p> <p>Also remember that the RESETREAS register is only cleared during a brownout or power on reset or the individual fields can be reset by writing a &#39;1&#39; to it.</p> <p>Do you run any example code? The ble examples will by default setup the buttons to wake up the chip if they are pushed.</p><div style="clear:both;"></div>