Operating modes
•
The following table shows an overview of the
General-Purpose Input/Output (GPIO)
s used for the UART
connections on nRF9160 and nRF52840:
nRF91 APP1
nRF91 APP2
nRF52840
TXD
P0.29
P0.01
P0.03
RXD
P0.28
P0.00
P0.05
CTS
P0.26
P0.15
P0.07
RTS
P0.27
P0.14
P1.08
Table 1: GPIOs used for virtual COM ports on nRF9160 and nRF52840
Note:
• Baud rate 921 600 is not supported through the virtual COM port.
3.1.3 MSD
The interface MCU features a
. This makes the
appear as an external drive
on your computer.
This drive can be used for drag-and-drop programming. However, files cannot be stored on this drive. By
copying a HEX file to the drive, the interface MCU will program the file to the device. The J-Link OB will
program the target that is selected with the nRF52/nRF91 switch (
SW10
). For limitations on nRF52840 use,
see
on page 20.
Note:
• Windows might try to defragment the MSD part of the interface MCU. If this happens, the
interface MCU will disconnect and become unresponsive. To return to normal operation, the DK
must be power cycled.
• Your antivirus software might try to scan the MSD part of the interface MCU. Some antivirus
programs trigger a false positive alert in one of the files and quarantine the unit. If this happens,
the interface MCU will become unresponsive.
• If your computer is set up to boot from USB, it can try to boot from the if the DK is connected
during boot. This can be avoided by unplugging the DK before a computer restart or changing
the boot sequence of the computer.
You can also disable the MSD of the kit by using the
msddisable
command in J-Link Commander. To
enable, use the
msdenable
command. These commands take effect after a power cycle of the DK and
stay this way until changed again.
3.1.4 Reset
The nRF9160 DK is equipped with a RESET button (
SW5
).
By default, the RESET button is connected to the interface MCU that will forward the reset signal to the
, depending on the state of the nRF52/nRF91 switch. If IF
MCU DISCONNECT is activated, the RESET button will be connected to the nRF9160 SiP directly.
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