Connection Between JLink EDU and Nrf51822https://devzone.nordicsemi.com/f/nordic-q-a/21570/connection-between-jlink-edu-and-nrf51822Hi, I used to use an imitated Jlink debugger to program/debug my target board(one Nrf51822 on it) There are pins connection between them,it works just fine. Now I purchase a new Jlink EDU which is new to me. So my question is , in order to makeen-USTelligent Community 13Tue, 25 Apr 2017 03:07:05 GMTRE: Connection Between JLink EDU and Nrf51822https://devzone.nordicsemi.com/thread/84710?ContentTypeID=1Tue, 25 Apr 2017 03:07:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a670d811-aaa6-49ce-973b-f2c112833cb9BK<p>Hi BS, Thank you so much for your answer! : )</p><div style="clear:both;"></div>RE: Connection Between JLink EDU and Nrf51822https://devzone.nordicsemi.com/thread/84709?ContentTypeID=1Mon, 24 Apr 2017 10:44:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e54da229-db6d-407a-8a51-ad24f45746b6bjorn-spockeli<p>Hi BK,</p> <p>Q1: Yes, in order to program the nRF51822( or any Cortex-M0 for that matter) you will need to connect SWCLK, SWDIO, GND and VTref (Target reference voltage). VTref must be connected to VDD on the nRF51822 device.</p> <p>Q2: Correct, do not connect the 5V supply from the JLink EDU to your nRF51822. You need to power you nRF51822 device from an external 1.8-3.6V supply.</p><div style="clear:both;"></div>