The interface MCU on the nRF5340 DK runs
SEGGER J-Link Onboard (OB) interface firmware. It is used to program and
debug the application firmware of the nRF5340System on Chip (SoC).
Figure 1. Interface MCU
Reset button Reset button (SW5) is connected to the interface MCU on the DK and resets the nRF5340SoC or any device connected to the external programming connectors.
Virtual serial ports
The interface MCU features two virtual serial ports, each with a UART interface.
Mass Storage Device
The interface MCU features aMSD. This makes the DK appear as an external drive on your computer.