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

int main(void)
{

    DDRB = 0x01;                        // Setup P0 as output
    PORTD |= 0x08;                      // Activate Apullupressistor of PD3
    GICR |= (1 << INT1);                // Enable INT1
    MCUCR |= (1 << ISC10)|(1 << ISC11); // INT1 is executed on rising edge

    sei();                              // Set the I-bit in SREG

    for(;;);                            // The main loop stays empty and
                                        // could contain some code you want.

    return 0;                           // This line will never be executed
}


// Interrupt subroutine for external interrupt 0
ISR(INT1_vect)                            
{
    PORTB ^= 0x01;                      // Toggle PB0

}