pt2272.c

一个基于51单片机的报警系统。包含有电路图

#include <reg51.h>
#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int


sbit _RW=P3^6;				//RD   RW
sbit _RD=P3^7;
sbit S_RS=P1^6;				//RS
sbit S_RW=P1^7;
sbit Y0=P2^5;				//74LS138 input
sbit E=P3^5;
sbit Y2=P2^7;
sbit P05=P0^5;



main()
{
 while(1)
        {
         P05=1;
         P05=0;
         P05=1;
         P05=0;
        Y2=0;
        Y0=0;
        S_RS=0;
        S_RW=0;
        E=1;
        _RD=1;
        _RD=0;
        
        P0=0X30;
        _RW=0;

        _RW=1;
        P0=0x30;
        _RW=0;

        _RW=1;
        P0=0X3B;
        _RW=0;

        _RW=1;
        P0=0XE1;
        _RW=0;

        _RW=1;
        P0=0XC6;
        _RW=0;

       E=0;
       S_RS=1;
       S_RW=1;
        Y0=1;
        Y2=1;
        }
}