51单片机中断和查询工作模式的区别

ID:80436 · 发表于 2015-5-20 18:17

中断是硬件自动的清零，查询如果是查询的TFX就必须软件清零，如果查询的是THX和TLX就也是硬件自动的清零。验证的程序如：

#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
uchar count ;
sbit LED=P3^0;
void main()
{
TMOD = 0X01;
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%256;
ET0 =1;
TR0 = 1;
while(1)
{
      while(TF0 == 1)
{
if(count++ == 50)
{
        LED =!LED;
}
TH0 = (65536 - 50000)/256;
      TL0 = (65536 - 50000)%256;
        TF0 = 0;
}    //查询工作的模式软件清零
}
}

#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
uint count=0;
void main()
{
   TMOD = 0X01;
      TH0 = (65536-50000)/256;
      TL0 =(65536-50000)%256;
      ET0 = 1;
      TR0 = 1;
      while(1)
      {
            if((TH0 == 65535/256)&&(TL0 == 65535%256)) {
count++;
if(count == 50)
{
P3 = ~P3;
count = 0;
}
      TH0 =(65536-50000)/256;
         TL0 =(65536-50000)%256;
}
      }
}

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