I have a design that had previously only used Serial communication to talk to the NRF52840 and did not use the USB interface. For this coming design we want to use the USB interface to talk to the NRF52840 but we would still like to keep the Serial communication available in case the USB interface does not work. I have added 0 ohm jumpers to be able to disconnect the serial lines if using USB (R8 and R17) or disconnect USB if using Serial lines (R6 and R16). My question is can I remove components R6 and R16 completely and turn off the USB interface through the register commands and populate R8 and R17 and use Serial communication without it being affected by the USB interface that is still physically connected? The serial lines RXD and TXD run to AD10 and B19 pins, respectively. The USB and Serial lines both use a USB-C connector for communication to outside world.
