#define F_CPU 9216000UL
#include <util/delay.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdlib.h>






void USART_init(void);
void InitTimer0(void);
void StartTimer0(void);








void USART_init(void){
	UCSR0A = (1<<U2X0);
	UBRR0H = (uint8_t)(4>>8);
	UBRR0L = (uint8_t)(4);
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	UCSR0C = (3<<UCSZ00);

}


void InitTimer0(void)
{

  OCR0A=(119);   //119             //9k6Hz
    TCCR0A |= (1<<WGM01);  //Set CTC mode
}



void StartTimer0(void)
{

  TCCR0B |=(1<<CS01); //Set Prescaler 64 and start timer //|(1<<CS00)
}








int main(void)
{


	DDRB|=(1<<DDB0);
	USART_init();

	InitTimer0();
	sei();





StartTimer0();

TIMSK0 |= (1<<OCIE0A);


		while (1)
		{

		}
	}





ISR (TIMER0_COMPA_vect)
{
	static uint8_t cnt; //unser "i"
	PORTB =(1<<PB0);

cnt++;

UDR0=(cnt);



      }