https://devzone.nordicsemi.com/f/nordic-q-a/9150/nrf51821-custom-boardI want to make a custom board using nRF51822. Currently I am using nRF go studio starter kit and pca10005 board. I am using segger jtag programmer for loading code to the ic. The connection to the board and programmer is done by a 10 line cable. If Ien-USTelligent Community 13Thu, 10 Sep 2015 09:28:29 GMThttps://devzone.nordicsemi.com/thread/33710?ContentTypeID=1Thu, 10 Sep 2015 09:28:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e4c1d37b-4b15-4c98-b77a-03814884c135Stian R&#248;ed Hafskjold<p>You need a debugger that supports the SWD (Serial Wire Debug) interface. Since you are already debugging the chip with your J-Link, it supports it.</p> <p>Then, you just need to connect the SWDIO and the SWCLK pins from the chip to the debugger, and also the VTref (supply voltage reference). If you have a JTAG programmer with SWD support, the SWDIO and SWCLK are overlaid on the TMS and TCK pins.</p> <p>Look at the SWD interface description here, <a href="https://www.segger.com/interface-description.html">www.segger.com/interface-description.html</a>, the SWO is not used and RESET is not needed.</p><div style="clear:both;"></div>