Each GPIOTE channel is associated with one physical GPIO pin through the CONFIG.PSEL field.
When Event mode is selected in CONFIG.MODE, the pin specified by CONFIG.PSEL will be configured as an input, overriding the DIR setting in GPIO. Similarly, when Task mode is selected in CONFIG.MODE, the pin specified by CONFIG.PSEL will be configured as an output overriding the DIR setting and OUT value in GPIO. When Disabled is selected in CONFIG.MODE, the pin specified by CONFIG.PSEL will use its configuration from the PIN[n].CNF registers in GPIO.
Note: A pin can only be assigned to one GPIOTE channel at a time. Failing to do so may result in
unpredictable behavior.