https://devzone.nordicsemi.com/f/nordic-q-a/54208/edge-triggered-wake-up-from-system-off-mode-in-nrf51822Hello, I am working on nRF51822, SDK12.3.0 in IAR workbench. I am use init pin 2 as an interrupt. Device will advertise for 20 minute after 20 minute device go to sleep. I want to wake up the chip only when pin 2 detect falling edge. I have useden-USTelligent Community 13Sun, 10 Nov 2019 20:03:58 GMThttps://devzone.nordicsemi.com/thread/219368?ContentTypeID=1Sun, 10 Nov 2019 20:03:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65595b50-c3b2-4aba-964a-4a9a5d9c79b7Dmitry<p><span>Hi,</span></p> <p><span>you can configure a level opposite to current one. The drawback is an additional false wake-up at rising edge, but it seems there is no other way.</span></p> <p><span><pre class="ui-code" data-mode="c_cpp">nrf_gpio_pin_sense_t level = nrf_gpio_pin_read(2) ? NRF_GPIO_PIN_SENSE_LOW : NRF_GPIO_PIN_SENSE_HIGH; nrf_gpio_cfg_sense_set(2, level);</pre></span></p> <p><span></span></p><div style="clear:both;"></div>