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【51单片机倒计时选位最右侧2位显示秒钟后最左侧1位显示8两秒后复位初始状态2个外部中断组合按键功能】2022-7-5

news 2025/7/5 14:25:53

缘由proteus仿真倒计时数码管-编程语言-CSDN问答

#include "REG52.h"
unsigned char code smgduan[]=
{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,
0x7c,0x39,0x5e,0x79,0x71,0,64,15,56}; //共阴0~F消隐减号
unsigned char Js=0, miao=0, yc=10;//中断计时 秒 分 时 毫秒
bit sz=0;//设置
sbit k0=P3^0;
sbit k1=P3^2;
sbit k2=P3^3;
void smxs(unsigned char mz, unsigned char w)
{unsigned char Xd=0;P0=0;P0=smgduan[mz];P2=w;while(++Xd);
}
void ZhongDuanSheZhi()
{TH0+=(65536-9216*5)/256;/*定时器赋初值，定时50ms触发中断，自动补偿方式*/TL0+=(65536-9216*5)%256; TMOD=0X01;//16位定时器/计数器TR0=0; //启动定时器T0。ET0=1; //开启定时器EA=1; //全局中断开关EX0=IT0=1;//下降沿触发IT1=EX1=1;//开外部中断
}
void main()
{unsigned char Xd=0,qh=0,ss=0;unsigned int shu=0;ZhongDuanSheZhi();miao=yc;while(1){if(k0==0&&++Xd==0){sz=~sz;while(k0==0);}//设置按键if(sz==1)if(++ss>100){smxs(miao/10,1);smxs(miao%10,0);}else{smxs(16,1);smxs(16,0);}else{smxs(miao/10,1);smxs(miao%10,0);smxs(qh,4);//调试用可注释if(miao==0&&qh<2)smxs(8,7);else if(qh>1){miao=yc;qh=0;TR0=0;}}if(Js>19)//倒计时{Js=0;if(miao>0)--miao;else ++qh;}}
}
void ZhongDuan() interrupt 1
{++Js;TH0+=0X4c;TL0+=0X00;        
}
void WaiBuZhongDuan0() interrupt 0//外部中断0=0，1=2，引脚P3.2，INT0
{if(sz==1)miao=++yc;else TR0=1;
}
void WaiBuZhongDuan1() interrupt 2
{if(sz==1)miao=--yc;else TR0=0;
}