#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code S[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar x;
uint j=0;

delay1ms(uint i)//延时1毫秒
{
uchar t;
while(i--)
{
for(t=0;t<115;t++);
}
}

display(uchar x)//数码管显示
{
P2=0xef;
P0=S[x/10];
delay1ms(5);
P2=0xdf;
P0=S[x%10];
delay1ms(5);
P2=0xff;
}

void main()
{
TMOD=0x01;
EA=1;
IT0=0;
ET0=1;
TR0=1;
TH0=0x4c;
TL0=0x00;


while(1)        //20个50毫秒
{
do                       
{
TH0=0x4c;
TL0=0x00;
j=j+1;
}while(j<20);

j=0;
display(x);
x++;
}
}

void T0zhongduan() interrupt 1
{




}