#include <avr/io.h>
#include <stdio.h>
#include <avr/interrupt.h>
unsigned char count=0;
void init(void)
{
	cli();
	PORTE |= (1<<PE5);   	// Switch PullUp 
	DDRE &= (~0x05);	// PORTD PE5 Input Port
	EICRA =0;
	EICRB =0;
	EICRB |= (1<<ISC50);
	// External Interrupt 0 enable
	EIMSK |= (1 << INT5);
	sei();
}



int main(void)
{	init();
  DDRK = 0b11111111;
	PORTK = 0;
	while(1){	
}
}
// External Interrupt
ISR (INT5_vect)
{
	PORTK = ~PORTK;
	_delay_ms(500);
	EIMSK &= ~(1 << INT5);           	// External Interrupt 0 enable
}