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int cnt = 0;                               // Global variable cnt

void interrupt_ISR () org IVT_ADDR_INT1 {  // Interrupt rutine
  SREG_I_bit = 0;                          // Disable Interrupts
  cnt++;                                   // Increment variable cnt
  SREG_I_bit = 1;                          // Enable Interrupts
}

void main() {                    // Main program
  DDRD = 0xF7;                   // Set PORTD.3 as input
  DDRB = 0xFF;                   // Set PORTB as output

  // Clear PORTB and PORTD
  PORTD = 0;
  PORTB = 0;

  PCMSK = 0x08;                  // Set PORTD.3 as the interrupt pin in this example
  MCUCR = 0x08;                  // Set interrupt for falling edge on PORTD.3
  GIMSK = 0x80;                  // External interrupt for INT1 (PORTD.3) is enabled
  SREG_I_bit = 1;                // Enable Interrupts

  while(1){                      // Unending loop
    PORTB = cnt;                 // Write on PORTB value of varibale cnt
  }
}