[AVR Studio](atmega 128) Timer

#include<avr/io.h>

#define F_CPU 16000000UL

#include<util/delay.h>

#include"led.h"

#include"segment.h"

#include<avr/interrupt.h>

unsigned char TovVal = 0;

int count = 0;

void LED_BLINK(void)

{

PORTA = 0x00;

disp_seg(count % 60);

_delay_ms(300);

PORTA = 0xFF;

}

SIGNAL(SIG_OVERFLOW1)

{

TCNT1 =0xFFFF - 0X3DB8;      

TovVal++;

count++;

if(TovVal == 1)

{

LED_BLINK();

TovVal = 0;

}

   sei();

}

int main()

{

cli();

DDRA = 0XFF;

DDRF = 0xFF;

DDRB = 0xff;

DDRC = 0xff;

TCCR1A = 0x00;

TCCR1B = 0x05; 

TCNT1 =0xFFFF - 0X3DB8;

TIMSK |= 1 << TOIE1;

 

PORTA = 0xFF;

sei(); 

while(1)

{

}

}