#include <avr/io.h>
#include <avr/interrupt.h>


//typedef unsigned char  BYTE;
//typedef unsigned int   WORD;





void SIGNAL(SIG_OVERFLOW0)        /* signal handler for tcnt0 overflow interrupt */
{
	PORTB = ~PORTB;
}


void initialisierung(void)
{
	
	TCCR0 |= (1<<CS01);//(1<<CS02)|(1<<CS00); 			//Timer clock = system clock 1024
	TIFR |= (1<<TOV0); 						//Clear TOV0 clear pending interrupts
	TIMSK |= (1<<TOIE0); 						//Enable Timer0 Overflow Interrupt
	
	DDRB = 0xFF; 							//Set Port B as//output
	
	sei();
}

int main(void)
{
	volatile unsigned char i = 1;
		
	initialisierung();		// wird nur einmal ausgeführt
	
	while(i);
	return(0);
}