Ok, I see what you mean - I guess that is from Arduino - AttachInterrupt; could be that was written for the ATmega1280, and I copied data for the ATmega2560?
The only differences from the AVR mega1280 and mega2560 is the increase in the various memory sizes (flash,sram,eeprom) for the 2560, all internal hardware peripherals and pin assignments are the same.
By the way, nice job on the pin mapping picture.
Lefty