To use the Serial Wire Debug (SWD) in the highvoltage mode of the nrf52840, do I have to drop the voltage on the SWDIO and SWDCLK ??

[nosebooster]

I am trying to make RF USB dongle using nrf52840.

Before the PCB production, we are using DK to test, but the firmware is not uploaded because VDDH and VBUS of DK are connected and 5V is applied.

Also, VDDH and VDD are not connected on the DK circuit of the altium file, but the same voltage is always outputted even if it is not connected by a line.

To use the Serial Wire Debug (SWD) in the highvoltage mode of the nrf52840, do I have to drop the voltage on the SWDIO and SWDCLK

[Stian Røed Hafskjold]

Hi, yes you have to drop the voltage to match the VDD voltage (the output voltage of REG0)