Source Code:

    

      

      /*
 * Example10_10.c
 *
 * Created: 05/02/2017 12:16:22 
 *  Author: Naimi
 */ 


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

int main ( )
{
	DDRB |= (1<<1)|(1<<3);		//make DDRB.1 and DDRB.3 output
	DDRC = 0x00;		//make PORTC input
	PORTC = 0xFF;		//enable pull-up
	DDRD = 0xFF;		//make PORTD output

	TCNT0 = -160;
	TCCR0A = 0x00;
	TCCR0B = 0x01;		//Normal mode, int clk, no prescaler

	TCNT1H = (-1600)>>8;	//the high byte
	TCNT1L = (-1600);		//the low byte
	TCCR1A = 0x00;
	TCCR1B = 0x01;
	
	TIMSK0 = (1<<TOIE0); //enable Timers 0 interrupt
	TIMSK1 = (1<<TOIE1); //enable Timers 1 interrupt
	sei ();				 //enable interrupts

	while (1)			//wait here
		PORTD = PINC;
}

ISR (TIMER0_OVF_vect)		//ISR for Timer0 overflow
{
	TCNT0 = -160;	   		//TCNT0 = -160 (reload for next round)
	PORTB ^= (1<<1);	   	//toggle PORTB.1
}

ISR (TIMER1_OVF_vect)	   	//ISR for Timer0 overflow
{
	TCNT1H = (-1600)>>8;
	TCNT1L = (-1600);		//TCNT1 = -1600 (reload for next round)

	PORTB ^= (1<<3);		//toggle PORTB.3
}