#include <avr/signal.h>
#include <avr/interrupt.h>
#include <avr/delay.h>

unsigned char a=0, b=0;

SIGNAL(SIG_OVERFLOW0)
{
 a++;
}

SIGNAL(SIG_OVERFLOW2)
{
 b++;
}

int main(void)
{
    TCCR0=_BV(CS00);
    TCCR2=_BV(CS01);
    TIMSK=_BV(TOIE0)|_BV(TOIE2);
    sei();
    for (;;) {
    //Wait 10us @ 8 MHz
     _delay_loop_2(20);
    }
}