#include <mega16.h>
unsigned char a,b;

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
TCNT0=0xAE;
++a;
// Place your code here
if(a==5)
{
a=0;
PORTD.3^=1;
}
}

// Timer 2 overflow interrupt service routine
interrupt [TIM2_OVF] void timer2_ovf_isr(void)
{
TCNT2=0xDE;
++b;
// Place your code here
if(b==2)
{
b=0;
PORTD.4^=1;
}
}

void main(void)
{

PORTA=0x00;
DDRA=0x00;

PORTB=0x00;
DDRB=0x08;

PORTC=0x00;
DDRC=0x00;

PORTD=0x67;
DDRD=0x98;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 1000,000 kHz
// Mode: Normal top=FFh
// OC0 output: Toggle on compare match
TCCR0=0x11;
TCNT0=0xAE;
OCR0=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: 1000,000 kHz
// Mode: Normal top=FFh
// OC2 output: Toggle on compare match
ASSR=0x00;
TCCR2=0x11;
TCNT2=0xDE;
OCR2=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x41;

// Global enable interrupts
#asm("sei")

while (1)
      {
      // Place your code here

      };
}