#include<avr/io.h>
#include <avr/signal.h>
#define uchar unsigned char 
#define uint unsigned int
uchar miao,fen,shi,mg,ms,fg,fs,ss,sg;
uchar table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void delay(uint i)
{
	uint x,y;
	for(x=i;x!=0;x--)
	for(y=51510;y!=0;y--);
} 
void init()
{
	DDRC=0XFF;
	DDRA=0XFF;
	SREG|=0X80;
	TIMSK|=0X04;
	TCCR1B|=0X04;
	TCNT1H=(65535-31250)/256;
	TCNT1L=(65535-31250)%256;
}
SIGNAL(SIG_OVERFLOW1)
{
	TCNT1H=(65535-31250)/256;
	TCNT1L=(65535-31250)%256;
	miao++;
	if(miao==60)
	{	miao=0;
		fen++;
		if(fen==60)
		{
			shi++;
			fen=0;
			if(shi==24)
			{
				shi=0;
			}
		}
	}
}
void chufa()
{   
	mg=miao%10;
	ms=miao/10;
	xianshi();
	fg=fen%10;
	fs=fen/10;
	xianshi();
	ss=shi/10;
	sg=shi%10;	
}
void xianshi()
{
	PORTC=table[mg];
	PORTA=0xfe;
	delay(100);
	PORTA=0xff;
	PORTC=table[ms];
	PORTA=0xfd;
	delay(100);
	PORTA=0xff;
	PORTC=table[fg];
	PORTA=0xfb;
	delay(100);
	PORTA=0xff;
	PORTC=table[fs];
	PORTA=0xf7;
	delay(100);
	PORTA=0xff;
	PORTC=table[sg];
	PORTA=0xef;
	delay(100);
	PORTA=0xff;
	PORTC=table[ss];
	PORTA=0xdf;
	delay(100);
	PORTA=0xff;

}
int main()
{
	init();
	while(1)
	{
	   
		chufa();
		xianshi();
	}
}