Source Code:

    

      

      
#include "avr/io.h"
#include "avr/interrupt.h"

int main ()
{
	DDRA = 0xFF;		
	DDRD = 0xFF;		
	DDRB |= 0x40;		
	PORTB |= 0x01;		

	TCNT0 = -200;		
	TCCR0 = 0x06;   	 

	TCNT1H = (-31250)>>8;
	TCNT1L = (-31250)&0xFF;
	TCCR1A = 0x00;		
	TCCR1B = 0x04;		

	TIMSK = (1<<TOIE0)|(1<<TOIE1); 
	sei ();				 

	DDRC = 0x00;		
	DDRD = 0xFF;		

	while (1)			
		PORTD = PINC;	
}

ISR (TIMER0_OVF_vect)		
{
	TCNT0 = -200;		
	PORTB ^= 0x40;		
}

ISR (TIMER1_OVF_vect)	
{
	TCNT1H = (-31250)>>8;	
	TCNT1L = (-31250)&0xFF; 
	PORTA ++;			
}