keybord.c

以51单片机为微处理器

#define uchar unsigned char
#define uint  unsigned int

#include<reg52.h>
#include<absacc.h>

sbit P2_0=P2^0;
sbit P2_1=P2^1;
sbit P2_2=P2^2;

uchar Keyvalue;

void keybord() interrupt 0
{
    P2_0=0;
    P2_1=0;
    P2_2=0;     //控制片选选通

    SBUF=0X10;
    while(!TI);
	TI=0;

    Keyvalue=SBUF;
    while(!RI);
    RI=0;
   
}

void main()
{
   EA=1;         //CPU开中断
   EX0=1;        //打开INT0中断
   IT0=1;        //设定INT0为负跳变触发
   SCON=0X10;    //设定串口工作方式

   switch(Keyvalue)
   {
     case 0x00: break;
	 case 0x01: break;
   }
   while(1);
}