#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code table1[]={50,3,25};
uchar code table2[]={55,20,3};
uchar a=50,b=55,n=0,m=0;
uchar j,k,c3,c2,c1,c0;
uchar pp;
void delay(unsigned int i)
{
int j;
for(i;i>0;i--)
for(j=20;j>0;j--);
}
void display(uchar x,uchar y,uchar o,uchar p)
{
P2=0x02;
P3=table[x];
delay(5);
P3=0xff;
P2=0x01;
P3=table[y];
delay(5);
P3=0xff;
P2=0x04;
P3=table[o];
delay(5);
P3=0xff;
P2=0x08;
P3=table[p];
delay(5);
P3=0x00;
}
void main()
{
TMOD=0x01;
TR0=1;
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;
ET0=1;
EA=1;
while(1)
{
if(TF0==1)
{
TF0=0;
pp++;
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;
}
if(pp==20)
{
pp=0;
a--;
b--;
if(a==0)
{
n++;
a=table1[n];
if(n==2)
{
n=0;
}
}
if(b==0)
{
m++;
b=table2[m];
if(m==2)
{
m=0;
}
}
}
c0=a%10;
c1=a/10;
c2=b%10;
c3=b/10;
display(c1,c0,c2,c3);
}
}
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