The interface MCU on the nRF52 DK runs
SEGGER J-Link Onboard (OB) interface firmware. It is used to program and
debug the application firmware of the nRF52832System on Chip (SoC).
Figure 1. Interface MCU
Reset button Reset button (SW5) is connected to the interface MCU on the DK and resets the nRF52832SoC or any device connected to the external programming connectors.
Virtual serial port
The interface MCU features a UART interface through a virtual serial port. One port is connected to the physical port on the DK, and the other is not usable.
Mass Storage Device
The interface MCU features aMSD. This makes the DK appear as an external drive on your computer.