【51单片机累计的时间为1分30秒时蜂鸣器叫】2022-7-29

缘由利用51单片机来进行计时操作-编程语言-CSDN问答

#include "REG52.h"
sbit BEEP=P2^5;
unsigned char Js=0,miao=0,fen=0;
unsigned char code SmZiFu[]={63,6,91,79,102,109,125,7,127,111};//0-9.
void smxs(unsigned char mz, unsigned char w)
{unsigned char Xd=0;P0=255;P0=255-SmZiFu[mz];P2=w;while(++Xd);
}
void ZhongDuanSheZhi()
{TH0+=(65536-9216)/256;/*定时器赋初值，定时10ms触发中断，自动补偿方式*/TL0+=(65536-9216)%256; TMOD=0X01;//16位定时器/计数器ET0=TR0=1; //启动定时器T0开启定时器。EA=1; //全局中断开关
}
void main()
{unsigned char k=0,p=0;ZhongDuanSheZhi();while(1){smxs(fen/10,1);smxs(fen%10,2);smxs(miao/10,4);smxs(miao%10,8);if(k==3)BEEP=!BEEP;if(Js==100)//秒{if(++miao==60){miao=0;if(++fen==60)fen=0;}if(miao==30||miao==0)++k;if(k==3&&(miao>31||miao>1))k=0;Js=0;}}
}
void ZhongDuan() interrupt 1
{++Js;TH0+=(65536-9216)/256;TL0+=(65536-9216)%256;       
}