#include<reg51.h> 
#define uchar unsigned char 
uchar j,k,i,a,A1,A2,second; 
sbit dula=P2^6; 
sbit wela=P2^7; 
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; 
void delay(uchar i) 
{ 
for(j=i;j>0;j--) 
for(k=125;k>0;k--); 
} 
void display(uchar sh_c,uchar g_c) 
{ 
dula=0; 
P0=table[sh_c]; 
dula=1; 
dula=0; 

wela=0; 
P0=0xfe; 
wela=1; 
wela=0; 
delay(5); 

P0=table[g_c]; 
dula=1; 
dula=0; 

P0=0xfd; 
wela=1; 
wela=0; 
delay(5); 
} 

void main() 
{ 
while(1) 
{ 
second++; 
if(second==60) 
second=0; 
A1=second/10; 
A2=second%10; 
for(a=50;a>0;a--) 
{ display(A1,A2);}; 
} 

}