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標(biāo)題: 51單片機中斷和查詢工作模式的區(qū)別 [打印本頁]

作者: liuqq 時間: 2015-5-20 18:17
標(biāo)題: 51單片機中斷和查詢工作模式的區(qū)別
中斷是硬件自動的清零，查詢?nèi)绻遣樵兊腡FX就必須軟件清零，如果查詢的是THX和TLX就也是硬件自動的清零。驗證的程序如：

#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;
}    //查詢工作的模式軟件清零
}
}

#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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