3
Interface MCU
The interface MCU on the nRF52 DK runs SEGGER J-Link Onboard (OB) interface firmware and is used to
program and debug the firmware of the nRF52832 SoC.
Figure 2: Interface MCU
3.1 Reset button
The nRF52 DK has a Reset button (SW5).
This button is connected to the interface MCU on the DK and resets the nRF52832 SoC or any device
connected to the external programming connectors.
For the reset button to work, pin reset on P0.21 must be enabled in the embedded firmware of the
nRF52832SoC.
3.2 Virtual serial port
The interface MCU features a Universal Asynchronous Receiver/Transmitter (UART) interface through a
virtual serial port. One port is connected to the physical port on the DK, and the other is not usable.
The virtual serial port has the following features:
• Flexible baud rate setting up to 1 Mbps (baud rate 921,600 bps is not supported)
• Optional Hardware Flow Control (HWFC)
• Tri-stated UART lines when no terminal is connected
The following table shows an overview of the UART connections on the nRF52832 SoC and the interface
MCU.
4397_500
8
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