51 单片机定时器数码管从1数到100（带三个按键控制开始，暂停，

#include <reg51.h>#define uint unsigned int#define uchar unsigned charsbit wei=P2^7;sbit duan=P2^6;sbit key1=P3^4;sbit key2=P3^5;sbit key3=P3^6;uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//1~9    //0~9,0x77,0x7c,0x39,0x5e,0x79,0x71uint number;void delay(uint xms)//延迟函数{   uint i;uchar j;   for(i=xms;i>0;i--)   for(j=110;j>0;j--);}void show(uint ge,uint shi){    ge=number%10;    shi=number/10;         wei=1;    P0 = 0xfe;    wei=0;    duan=1;    P0=table[shi];    duan=0;    P0=0xff;    delay(5);    wei=1;    P0=0xfd;    wei=0;    duan=1;    P0=table[ge];    duan=0;    P0=0xff;    delay(5); }void initial_mcu(){                                                       TMOD=0x01; //定时器0和1工作在16位模式    TH0=(65536-45872)/256;    TL0=(65536-45872)%256;    EA=1;    ET0=1;    //TR0=1;}void buttons(){         if(key1==0)         {            delay(10); //键盘消抖            if(key1==0)            {                                                      number=0;             }                          }                     if(key2==0)         {            delay(10); //键盘消抖            if(key2==0)            {                                                      TR0=1;            }                          }                     if(key3==0)         {            delay(10); //键盘消抖            if(key3==0)            {                                                      TR0=0;            }                          }                                 }void main (){      initial_mcu();//定时器初始化                     while(1)         {            buttons();              show();                                  }     }void timer0() interrupt 1 {         uint num;        TH0=(65536-45872)/256;    TL0=(65536-45872)%256;    num++;        if(num==20)    {         num=0;         number++;         if(number==100)         {            number=0;         }    }}

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