7
Interface MCU
The interface MCU on the nRF52833 DK runs SEGGER J-Link OB interface firmware and is used to program
and debug the firmware of the nRF52833 SoC.
Figure 2: Interface MCU
7.1 IF Boot/Reset button
The nRF52833 DK is equipped with an IF Boot/Reset button (SW5).
This button is connected to the interface MCU on the DK and has two functions:
• Resetting the nRF52833 SoC.
• Entering bootloader mode of the interface MCU.
During normal operation the button will function as a reset button for the nRF52833 SoC. For this to work,
pin reset on P0.18 needs to be enabled in the SoC.
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 LED5 starts to blink. You can power
up the DK either by disconnecting and reconnecting the USB cable or by toggling the power switch (SW8).
Note: Pin reset can be enabled by adding the CONFIG_GPIO_AS_PINRESET variable to the compiler
preprocessor macros. The way of doing this depends on the IDE/toolchain in use:
• When using SEGGER Embedded Studio, go to Project > Edit Options > Code > Preprocessor >
Preprocessor Definitions and add the CONFIG_GPIO_AS_PINRESET variable.
• When using Keil, go to Project > Options for Target > C/C++ > Preprocessor Symbols > Define
and add the CONFIG_GPIO_AS_PINRESET variable.
If your program does not enable pin reset, this functionality can also be enabled on an already
programmed device by calling nrfjprog.exe with argument --pinresetenable. To disable
pinreset again, reprogram with --chiperase.
7.2 Virtual COM port
The onboard interface MCU features a UART interface through a virtual COM port.
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