The onboard interface MCU features a UART interface through a virtual COM port.
The following table shows an overview of the UART connections on nRF5340 and the interface MCU.
GPIO nRF5340 | nRF5340 UART |
---|---|
P0.19 | RTS |
P0.20 | TXD |
P0.21 | CTS |
P0.22 | RXD |
The UART signals are routed directly to the interface MCU. The UART pins connected to the interface MCU are tri-stated when no terminal is connected to the virtual COM port on the computer.
The P0.19 (Request to Send (RTS)) and P0.21 (Clear to Send (CTS)) can be used freely when HWFC is disabled on the System on Chip (SoC).