#include <reg52.h>

#define uchar unsigned char

#define uint unsigned int

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71,0x00};

uchar intnum;

uchar sec;

void init()

{

TMOD=0x01; // 定時器模式選擇，選擇T0定時器，方式1

TR0=1; //1 開啟定時器0

ET0=1; //定時器0中斷使能位

EA=1; //使能全域性中斷

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

}

void time0() interrupt 1 //50ms

{

//TF0=0; //定時器0溢位 ，清楚中斷

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

intnum++;//溢位值加1

if(intnum==20)

{

intnum=0;

sec++;

if(sec==100)

{

sec=0;

}

}

}

void disp(uchar num1,uchar num2)

{

P0=table[num1];

P2=table[num2];

}

void main()

{

init();

while(1)

{

uchar a,b;

a=sec/10;

b=sec%10;

disp(a,b);

}