Looking into the schematics for the Arduino Mega I noticed that pins PE6 and PE7 are interrupt-enabled (INT6 and INT7 respectively); however, they remain unconnected to any Arduino I/O pin.
I'm designing a custom board based on the Atmega2560 and want to use the Arduino IDE/Compiler to upload my code to it, so I'm pretty much replicating a big part of the Arduino Mega schematic into my board.
However, I would really like to enable these two extra interrupt pins (having 8 interrupt pins in total) in my board, but I'm now sure how to proceed from the software side. How could I enable this new pins in order to use them from the Arduino compiler?
Thanks!