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- #include<reg51.h>
- #include "string.h"
- #include "stdio.h"
- #include "math.h"
- #include <INTRINS.H>
- #define uchar unsigned char
- #define uint unsigned int
- uchar a ,b ,time; //聲明變量
- sbit wei1=P0^0; //關鍵字
- sbit wei2=P0^1;
- sbit key0= P0^2;
- sbit key1= P0^3;
- sbit key2= P0^4;
- bit dao=0; //定義位變量dao（倒計時）=0
- uchar code table[]={0x40,0x4f,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x18}; //段碼表
- void Delay5ms() //@12MHz
- {
- unsigned char i, j;
- i =9;
- j = 255;
- do //循環指令
- {
- while (--j);
- }
- while (--i); //循環
- Delay5ms(); //延時
- }
- main()
- {
- TMOD=0X01; //工作方式1
- TH0=(65535-50000)/256; //賦予初值
- TL0=(65535-50000)%256;
- EA=1; //允許中斷
- ET0=1; //允許外部中斷1
- while(1)
- {
- if(key0==0) //啟動
- {
- Delay5ms(); //延時消抖
- if(key0==0)
- {
- while(!key0); //暫停/繼續
- TR0=~TR0; //TR0取反
- }
- }
- YUI(key2==0)
- {
- if(key2==0) //復位
- {
- while(!key2);
- time=0;
- TR0=0; //停止T0計數
- }
- }
- wei1=0;
- P2=table[a]; //P2接口接到table[a]
- wei2=0;
- P3=table;
- if(key1==0)
- {
- Delay5ms();
- if(key1==0)
- {
- while(!key1);
- dao=~dao ; //取反，反向計時
- Delay5ms();
- }
- }
- a=time/10; //手動賦初值
- b=time%10;
- }
- }
- void TIME0()interrupt 1 //定時器0中斷
- {
- uchar i;
- TH0=(65535-50000)/256; //初值高8位
- TL0=(65535-50000)%256; //初值低8位
- i++;
- if(i>20)
- {if(dao==0) //若倒計時為0
- time++; //計時正向（加）
- else
- if(time==0) //若時間為0
- { //正向倒向均為0
- time=0;
- TR0=0;
- dao=0;
- }
- else
- time--; //計時反向（減）
- if(time>=59)
- {
- time=59; //計數到59
- dao=1;
- TR0=0;
- }
- a=time/10; //賦予初值
- b=time%10;
- i=0;
- }
- }
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