单片机定时器仿真+程序倒计时,时间到了蜂鸣器发声

ID:991417 · 发表于 2022-3-29 22:46

秒倒计时，时间到了蜂鸣器发声
仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）

单片机源程序如下:
#include <reg51.h>
unsigned char count=0;
sbit LED_B1=P3^6;
sbit LED_A1=P3^7;
sbit fmq=P1^0;
unsigned char counter;
unsigned char NSF=10;

typedef unsigned int u16;       //对数据类型进行声明定义
typedef unsigned char u8;

sbit k1=P3^1;
sbit k2=P3^0;

sbit beep=P1^0;

u8 start=0;
void delayms(unsigned int xms);
void Init(void)
{
      TMOD=0x01;
      TH0=(65536-10000)/256;
      TL0=(65536-10000)%256;
      TR0=1;
      ET0=1;
EA=1;
}

void timer0(void) interrupt 1
{
      TMOD=0x01;
      TH0=(65536-50000)/256;
      TL0=(65536-50000)%256;
      TR0=1;
      ET0=1;
      EA=1;
         count++;
      if(count>19)
      {
         count=0;
      NSF--;

      }
}

void delayms(unsigned int xms)
      {
            unsigned int i,j;
            for(i=xms;i>0;i--)
                     for(j=110;j>0;j--);

      }
unsigned char table[]={0x3,0xcf,0x2a,0x4a,0xc6,0x52,0x12,0xcb,0x2,0x42};
void display1(unsigned char num1,unsigned char num2)
{
            LED_A1=1;
            P0=table[num1];

            delayms(10);
            LED_A1=0;

            LED_B1=1;
            P0=table[num2];

            delayms(10);
            LED_B1=0;
}
void main()
{
      while(1)
      {
      EA=1;       beep=1;
Init();
                  while(NSF!=0)
               {
               display1(NSF/10,NSF%10);
               delayms(10);
               }

Keil代码与Proteus仿真下载:

30秒倒计时.zip (81.06 KB, 下载次数: 104)