专家给指点下51遇到的问题

只看该作者 · 2013-11-19 20:49

本帖最后由 letao2013 于 2013-11-19 20:51 编辑

#include<reg52.h>
#include<intrins.h>
#include<stdio.h>
#define  uchar  unsigned char
#define  uint unsigned  int
//
sbit KEY1=P2^1;       //yi bu
sbit KEY2=P1^1;       // tong bu ting zhi

sbit KEY3=P3^2;       // tong bu fan zhuan       int0
sbit KEY4=P3^3;       // tong bu       int1

//电机
sbit M1=P2^7;
sbit M2=P2^6;
sbit M3=P2^5;

//闪烁灯
sbit LED1=P2^4;
sbit LED2=P2^3;
sbit LED3=P2^2;
//void  keyscan();
void delayms(uint x);

void delayms(uint x)
  {
uint i,j;
for(j=0;j<x;j++)
   for(i=0;i<110;i++);
}

void main()

  {

         delayms(100);
         P2=0xFF;
         P1=0xFF;




   IT0=1;
         IT1=1;
         EX0=1;
         EX1=1;
         EA=1;

      while(1)

   {


               if(KEY1==0)
               {
                        M1=0;
                        LED1=0;

                     }
            else
                           {
                              M1=1;
                              LED1=1;
                              }



               if(KEY2==0)
            {
                        M2=1;
                        LED2=1;
                        M3=1;
            LED3=1;

                     }


}

  }

void exist1() interrupt 2
  {
EX1=0;
M2=0;
LED2=0;
M3=1;
LED3=1;
EX1=1;
  }

void  exist0() interrupt 0
  {
EX0=0;
LED2=1;
M2=1;

M3=0;
LED3=0;
EX0=1;
  }
为啥按下KEY1键的时候，会进入中断0或者中断1？（KEY1，KEY2.KEY3，KEY4即图里S1，S2，S3，S4）