https://devzone.nordicsemi.com/f/nordic-q-a/101764/jlink-swd-header-connections-on-custom-nrf9160-board-programmed-from-nrf9160-dkHi there, we have a product that we initially prototyped with a SARA-R4 modem, but are pivoting to the nrf9160 platform because of the extreme power saving and simplicity of Zephyr development. I am in the process of redesigning our board, with the nrf9160en-USTelligent Community 13Thu, 13 Jul 2023 18:07:49 GMThttps://devzone.nordicsemi.com/thread/436338?ContentTypeID=1Thu, 13 Jul 2023 18:07:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26d7c2a7-ce14-4182-b5e0-141277a5fcb8Amarotica<p>Thank you for the information! That all makes perfect sense and I will disregard RESET and SWO.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/436165?ContentTypeID=1Thu, 13 Jul 2023 08:15:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5c6c5584-5724-437d-bc8d-7fb31a9e5b64ketiljo<p>Hi Taylor</p> <p>The signals you need to program the board are SWDIO, SWDCLK, SWD_SELCT and GND of course.</p> <p><span>SWD0_SELECT&nbsp;</span>is used to let the debugger&nbsp;know there&#39;s an external target so this must be connected to the same supply as VDD_GPIO on thh external board, 1.8 V in your case.&nbsp;&nbsp;</p> <p>RESET and SWO are not needed.&nbsp;</p> <p>Best regards,</p> <p>Ketil Aas-Johansen</p> <p></p><div style="clear:both;"></div>