User's Manual

The buttons are active low, which means that the input will be connected to ground when the
button isactivated. The SW1 button has no external pull-up resistor, but the reset button (SW2)
has a 10 k pull-upresistor. To use SW1, P1.06 must be configured as an input with an internal
pull-up resistor.
The LEDs are active low, which means that writing a logical zero '0' to the output pin will
illuminate theLED.
6.5 32.768 kHz crystal
The nRF52840 Dongle is equipped with a 32.768 kHz crystal (X2) for high accuracy and low
average powerconsumption.