The onboard interface MCU features two Universal Asynchronous Receiver/Transmitter (UART) interfaces through virtual serial ports.
The following table shows an overview of the UART connections on nRF5340 SoC and the interface MCU.
Signal | GPIO nRF5340 UART_1 | GPIO nRF5340 UART_2 |
---|---|---|
RTS | P1.05 | P0.19 |
TXD | P1.01 | P0.20 |
CTS | P1.04 | P0.21 |
RXD | P1.00 | P0.22 |
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 serial port on the computer.
Pins P0.19 (Request to Send (RTS)) and P0.21 (Clear to Send (CTS)) can be used freely when HWFC is disabled on the SoC.