I am new to Arduino and I need to use PD0 and PD1 as inputs for a pin change interrupt. The other inputs on PORTD generate the interrupt as expected so I know that it does work but PD0 and PD1 don’t. They work fine as outputs but just not in this mode. I realize that these are reserved for serial communications but I have no need for the serial communications but I do have a need for this full port. What am I missing here? I do have the USB attached for flashing the part, could this be a contention somehow.