https://devzone.nordicsemi.com/f/nordic-q-a/96164/nrf52-programming-with-swclk-tied-to-nfc1Hi There, I am afraid I already know the answer, but I figured I would see if there is a way out. I am using the NRF52833 integrated into the BL653u module from Laird, and in layout I shorted the SWCLK line to the NFC1 pin, to avoid having to move toen-USTelligent Community 13Mon, 30 Jan 2023 22:08:39 GMThttps://devzone.nordicsemi.com/thread/407195?ContentTypeID=1Mon, 30 Jan 2023 22:08:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ef4d553-6a64-4052-9b8d-f50e5126cbf2functional_eng<p>Hah this did it, thank you! I had tried something similar and it didn&#39;t work, but I gave it another shot and got it working. Thank you so much, this would have been a huge issue.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/407194?ContentTypeID=1Mon, 30 Jan 2023 21:54:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b459f45f-36e4-4141-abb5-cfb882f32dcfhmolesworth<p>J-Link Plus target interface voltage range on SWD and SWCLK is between 1.2 to 5 volts, so simply lower VDD to the BL653 module from 3.3 volts to (say) 2.2 volts and it should work fine as (I believe) the NFC clamp voltage is fixed and not a % of VDD. Hopefully temporarily changing VDD while programming is possible with the hardware design of the board.</p><div style="clear:both;"></div>