https://devzone.nordicsemi.com/f/nordic-q-a/18626/what-is-the-purpose-of-atsam3u2c-ic-mcu-in-nrf51-dkATSAM3U2C Is an integrated circuit Micro controller uniten-USTelligent Community 13Wed, 28 Dec 2016 04:51:44 GMThttps://devzone.nordicsemi.com/thread/71916?ContentTypeID=1Wed, 28 Dec 2016 04:51:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b0fbb302-9334-45e5-8309-ced755cdb626RK<p>It&#39;s the JLink debugger.</p><div style="clear:both;"></div>