#include <mega128.h>
#include <delay.h>
 unsigned char a[]={0xc0,0xf9,0xa4,0xb0,0x99 ,0x92 ,
0x82 ,0xf8 ,0x80 ,0x90 ,0x88 ,0x83,0xc6,0xa1,0x86,0x8e,0x8c,0xff};//數組a[]放數碼管的段碼
	


void main(void)
{
unsigned  char i,j,k;//定義變量
DDRA=0XFF;
DDRD=0XFF;

while(1)
{

i=0xEF;      
for(j=0;j<=3;j++) //循環	
{        
 PORTD=i; //高電平有效 
 k=j*3;
 PORTA=a[k+1]; //把段碼a[1]，a[4]，a[7],a[10]分別顯示
 delay_ms(250);    //延時   
 i=i<<1;
}
        
//DDRB3=1;
}

}