nRF5340 DK virtual serial COM ports UART

The interface MCU features two virtual serial ports, each with a Universal Asynchronous Receiver/Transmitter (UART) interface.

The serial ports have the following features:

Flexible baud rate setting up to 1 Mbps (baud rate 921 600 bps is not supported)
Dynamic Hardware Flow Control (HWFC)
Tri-stated UART lines when no terminal is connected

The following table lists the nRF5340 System on Chip (SoC) UART GPIO pins and their signals.

Table 1. nRF5340 GPIOs mapped to serial port/UART signals
Signal	nRF5340 UART_0 - Serial Port 0	nRF5340 UART_1 - Serial Port 1
RTS	P0.11/TRACEDATA0	P0.19
TXD	P1.01	P0.20
CTS	P0.10/TRACEDATA1	P0.21
RXD	P1.00	P0.22

Note: The serial ports on the nRF5340 DK PCB might be incorrectly labeled. VCOM0 label on the PCB refers to serial port 0 and VCOM2 refers to serial port 1.

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. The terminal software must send a Data Terminal Ready (DTR) signal to configure the UART interface MCU pins.

P0.11/P0.19 (Request to Send (RTS)) and P0.10/P0.21 (Clear to Send (CTS)) can be used for other purposes when HWFC is disabled on the SoC.

Virtual serial ports