#include<reg51.h>
#define uchar unsigned char

uchar code num[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar count=20,index=0;

void time0(void) interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
--count;

if(count==0)
{
count=20;
SBUF=num[index];
while(!TI);
TI=0;
++index;
if(index>9)
index=0;
}
}
void main()
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TMOD=0x01;
SCON=0x00;
PCON=0;
EA=1;
ET0=1;
TR0=1;
P1=0;
while(1);
}