nRF52 DK P20 debug out doesn't work

nRF52 DK P20 debug out doesn't workhttps://devzone.nordicsemi.com/f/nordic-q-a/55959/nrf52-dk-p20-debug-out-doesn-t-worknRF52DK external board with 51822 and mems I connect my external board with nRF52DK as this (left is board, right is nRF52DK): SWCLK -> SWDCLK SWDIO -> SWDIO VCC -> VDD GND -> GND However, it doesn't work. There is NO power supply to myen-USTelligent Community 13Wed, 25 Dec 2019 04:54:40 GMTRE: nRF52 DK P20 debug out doesn't workhttps://devzone.nordicsemi.com/thread/226816?ContentTypeID=1Wed, 25 Dec 2019 04:54:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc27a47e-9780-42c6-ab9f-157060c2cc19kfcube<p>VCC I connected to the #2 of p20, and GND connected to #8 (GND DETECT) of p20. I didn't provide power to my external board, as I thought the DK will do so? </p> <p></p> <p>Thanks,</p><div style="clear:both;"></div>