#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

#define byte unsigned char

volatile byte lastPins = 0;

#define isPinChanged(pin) ((diff >> pin) & 1)
#define isPinHigh(pin) ((mPins >> pin) & 1)
ISR(INT0_vect) {
   byte mPins = PINB;
   byte diff = mPins ^ lastPins;

   if(isPinChanged(2) && isPinHigh(1) && !isPinHigh(2)) {
      PORTB |= 1 << 0;
   }

   lastPins = mPins;
}
#undef isPinChanged
#undef isPinHigh

int main() {
   DDRB |= (1 << 1) | (1 << 2);
   PORTB &= ~(1 << 2);
   MCUCR |= (1 << 0);
   GIMSK |= (1 << 6);
   asm("sei");
   while(1) {
      asm("nop");
   }
   return 0;
}