https://devzone.nordicsemi.com/f/nordic-q-a/72917/wakeup-from-deep-sleep-over-spiI have an nRF52840 acting as a SPI slave to another processor. If I put the nRF52840 into a deep sleep mode, how can we wake it back up over SPI? I typically have only seen examples of using a GPIO to wake up from deep sleep.en-USTelligent Community 13Wed, 17 Mar 2021 14:13:11 GMThttps://devzone.nordicsemi.com/thread/300447?ContentTypeID=1Wed, 17 Mar 2021 14:13:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:454cf1cb-fe59-425e-b4d7-a90500a66df2J&#248;rgen Holmefjord<p>Hi,</p> <p>SPI is not&nbsp;supported as a wakeup source from deep sleep/<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html#unique_1384365742">system OFF mode</a>. You will have to configure one of the SPI lines (preferably SS/CSN) as a GPIO wakeup source, and then initialize SPIS when the chip is done waking up.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>