为什么这个单片机蜂鸣器才响十秒呢？我哪里出错了呢？求帮忙

ID:685171 · 发表于 2020-3-19 11:30

#include "reg52.h"
#include"intrins.h"

typedef unsigned int u16;
typedef unsigned char u8;

sbit beep=P1^5;
u8 flag=0;

void delay(u16 i)
{
while(i--);
}

void timer1()
{
TMOD|=0x10;
TH0=0XFC;
TL0=0X18;
ET0=1;
EA=1;
TR0=1;
}

void main()
{
   timer1();
         while(1)
         {
         if(flag==0)
         {
         beep=~beep;
         delay(10);
         }
      }
}

void timer2() interrupt 1
{
static u16 a;
TH0=0XFC;
TL0=0X18;
a++;
if(a==60000)
{
   flag=1;
      a=0;
}
}