(ATmega16A) Write two statements to enable External INT1. (ATxmega128A1) Write two statements to enable PORTC’s INT1 as a medium-level interrupt. Show how the SREG is generally preserved during...

(ATmega16A) Write two statements to enable External INT1. (ATxmega128A1) Write two statements to enable PORTC’s INT1 as a medium-level interrupt.

Show how the SREG is generally preserved during execution of an interrupt handler. Write instructions to place it on the stack and then show how the registers are restored just before the RETI instruction.