I am using PEx 10.4 to configure the processor on a TWR-K64F120M module. I would like to read SW3 using the GPIO but the switch is wired into GPIO A4 which is also used as the NMI input. After some searching, I found that there are actually TWO check boxes for the NMI under the CPU component.
One of these is at CPU > Properties > CPU interrupts/resets > Non-maskable interrupt. This one I CAN uncheck.
The second is at CPU > Properties > Common settings > NMI pin: This one I cannot uncheck (the selection is grayed out but checked).
The datasheet for the processor seems to say that this pin is not dedicated for use as NMI so I don't see a reason that I cannot disable the NMI--is this an issue in PEx? Is there a way for me to use this pin as GPIO?