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May I use only 2-wire SWD (SWCLK, SWDIO), Vcc (from target) and GND to debug target QN9080 system using QN9080 DK board

Question asked by Yuan Te Liu on Jan 30, 2019
Latest reply on Feb 6, 2019 by Gerardo Rodríguez

Due to available pins in our system, There are only 3 spare wires available from the connector of our system for debugger use. It is planned to be Vcc (from target system) SWCLK, and SWDIO. It did work well in our previous project using other Cortex M0 MCU (nRF51822). Can someone teach me if it is OK or not? (it is known that some debugging feature will be missing if no SWO signal.