3
Interface MCU
The interface MCU on the nRF52 DK runs SEGGER J-Link OB or Mbed OB interface firmware and is used to
program and debug the firmware of the nRF52832
Figure 2: Interface MCU
3.1 IF Boot/Reset button
The nRF52 DK has an IF Boot/Reset button (
SW5
).
This button is connected to the interface MCU on the
and has two functions:
• Resetting the nRF52832 SoC
• Entering the bootloader mode of the interface MCU
During normal operation the button functions as a reset button for the nRF52832
. For this to work,
pin reset on
P0.21
needs to be enabled in embedded firmware.
The button is also used to enter the bootloader mode of the interface MCU. To enter the bootloader
mode, keep the reset button pressed while powering up the DK until
LD5
starts to blink. You can power up
the DK either by disconnecting and reconnecting the USB cable or by toggling the power switch (
SW6
).
3.2 Virtual COM port
The onboard interface MCU features a
Universal Asynchronous Receiver/Transmitter (UART)
interface
through a virtual COM port.
The virtual COM port has the following features:
• Flexible baud rate setting up to 1 Mbps (baud rate 921 600 is not supported)
• Dynamic
• Tri-stated UART lines when no terminal is connected
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