实验注意：332电阻非常重要，以前做过类似的实验没有显示成功，就是电阻的问题，电阻太小不行，一般要超过1.5K，当然太大也不行。

实验名称：51单片机驱动1602显示万年历

实验说明：本实验使用硬件连接，相对于proteus仿真软件，更切合实际，体验在硬件制作过程中遇到的问题与解决的过程

实验硬件工具：51单片机最小模块，1602显示屏，一个332（3300欧姆）贴片小电阻，杜邦线若干

#include<reg52.h>
#define DataPort P1
sbit RS=P2^4;
sbit RW=P2^3;
sbit  E=P2^2;
char table1[]="0123456789-";




int second = 0;  //¶¨òåÃë
int point = 0;  //¶¨òå·Ö
int hour = 23;  //¶¨òåD¡ê±
int timer_cnt = 0;




void delay1ms() //@12.000MHz
{
unsigned char i, j;


i = 12;
j = 169;
do
{
while (--j);
} while (--i);
}
void delay3ms() //@12.000MHz
{
unsigned char i, j;


i = 100;
j = 1;
do
{
while (--j);
} while (--i);
}


void timer0init()
{
  TMOD  = 0x01; //éèÖö¨ê±Æ÷0Îa1Ä￡ê½16λ¼ÆêyÄ￡ê½
  ET0 = 1; //¿a¶¨ê±Æ÷0ÖD¶Ï
  EA = 1; //¿a×üÖD¶Ï
  TH0 = (65536-5000)/256; //¸ø¼ÆêyÆ÷¸ß°Ëλ¸33õÖμ
  TL0 = (65536-5000)%256; //¸ø¼ÆêyÆ÷μí°Ëλ¸33õÖμ//¶¨ê±5000′ξíóD5msò»′ÎÖD¶Ï
  TR0 = 1;  //Æô¶ˉ¶¨ê±Æ÷
}


void WriteCmd(char cmd)
{
RS=0;
RW=0;
E=0; 
DataPort=cmd;
delay3ms();

E=1;
delay1ms();
E=0;

}
void WriteDat(char dat)
{
RS=1;
RW=0;
E=0;
DataPort=dat;
delay3ms();

E=1;
delay1ms();
E=0;
}
void InitLcd1602()   //D¾Æ¬3õê¼»ˉ
{
WriteCmd(0x38);
delay3ms();
WriteCmd(0x38);
delay3ms();
WriteCmd(0x38);
delay3ms();
WriteCmd(0x08);//1رÕÏÔê¾Æá
WriteCmd(0x01);//ÏÔê¾ÇåÆá
delay3ms();
WriteCmd(0x06);//ÏÔê¾1a±êòƶˉ
WriteCmd(0x0c); //ÏÔ꾿a¼°1a±ê
}
void main()
{
int i;  
InitLcd1602(); //D¾Æ¬3õê¼»ˉ
timer0init();  //3õê¼»ˉ¶¨ê±Æ÷
while(1)
{
WriteCmd(0x80);
WriteDat(table1[hour/10]);
WriteDat(table1[hour%10]);
WriteDat(table1[10]);
WriteDat(table1[point/10]);
WriteDat(table1[point%10]);
WriteDat(table1[10]);
WriteDat(table1[second/10]);
WriteDat(table1[second%10]);
    }
}


void timer0() interrupt 1 //ÖD¶Ï·tÎñoˉêy
{
   TH0 = (65536-5000)/256; //ÿ′νøÖD¶Ï¶¼òa¸ø¼ÆêyÆ÷ÖØD¸3Öμ
   TL0 = (65536-5000)%256;
  timer_cnt++; //óÃà′¼Æêy½øÖD¶Ï¶àéù′Î
  if(timer_cnt==197) //μ±½øà′200′ÎÖD¶Ïê±oò¾íμÃò»Ãë￡¬second¼óò»
  {
   second++;
   timer_cnt = 0;
  }
  if(second==60)   //μ±Ãëμèóú60ê±
  {
    second = 0;   //ÃëÖØDÂÖμÎaáã
point++;    //·Ö¼óò»
  }
  if(point==60) //μ±·Öμèóú60ê±
  {
     point = 0;  //·ÖÖμÎaáã
 hour++;   //D¡ê±¼óò»
  }
  if(hour==24)
  {
hour = 0;
  }


}

/*--------------------------------------------------------------------------
REG52.H


Header file for generic 80C52 and 80C32 microcontroller.
Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/


#ifndef __REG52_H__
#define __REG52_H__


/*  BYTE Registers  */
sfr P0    = 0x80;
sfr P1    = 0x90;
sfr P2    = 0xA0;
sfr P3    = 0xB0;
sfr PSW   = 0xD0;
sfr ACC   = 0xE0;
sfr B     = 0xF0;
sfr SP    = 0x81;
sfr DPL   = 0x82;
sfr DPH   = 0x83;
sfr PCON  = 0x87;
sfr TCON  = 0x88;
sfr TMOD  = 0x89;
sfr TL0   = 0x8A;
sfr TL1   = 0x8B;
sfr TH0   = 0x8C;
sfr TH1   = 0x8D;
sfr IE    = 0xA8;
sfr IP    = 0xB8;
sfr SCON  = 0x98;
sfr SBUF  = 0x99;


/*  8052 Extensions  */
sfr T2CON  = 0xC8;
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2    = 0xCC;
sfr TH2    = 0xCD;




/*  BIT Registers  */
/*  PSW  */
sbit CY    = PSW^7;
sbit AC    = PSW^6;
sbit F0    = PSW^5;
sbit RS1   = PSW^4;
sbit RS0   = PSW^3;
sbit OV    = PSW^2;
sbit P     = PSW^0; //8052 only


/*  TCON  */
sbit TF1   = TCON^7;
sbit TR1   = TCON^6;
sbit TF0   = TCON^5;
sbit TR0   = TCON^4;
sbit IE1   = TCON^3;
sbit IT1   = TCON^2;
sbit IE0   = TCON^1;
sbit IT0   = TCON^0;


/*  IE  */
sbit EA    = IE^7;
sbit ET2   = IE^5; //8052 only
sbit ES    = IE^4;
sbit ET1   = IE^3;
sbit EX1   = IE^2;
sbit ET0   = IE^1;
sbit EX0   = IE^0;


/*  IP  */
sbit PT2   = IP^5;
sbit PS    = IP^4;
sbit PT1   = IP^3;
sbit PX1   = IP^2;
sbit PT0   = IP^1;
sbit PX0   = IP^0;


/*  P3  */
sbit RD    = P3^7;
sbit WR    = P3^6;
sbit T1    = P3^5;
sbit T0    = P3^4;
sbit INT1  = P3^3;
sbit INT0  = P3^2;
sbit TXD   = P3^1;
sbit RXD   = P3^0;


/*  SCON  */
sbit SM0   = SCON^7;
sbit SM1   = SCON^6;
sbit SM2   = SCON^5;
sbit REN   = SCON^4;
sbit TB8   = SCON^3;
sbit RB8   = SCON^2;
sbit TI    = SCON^1;
sbit RI    = SCON^0;


/*  P1  */
sbit T2EX  = P1^1; // 8052 only
sbit T2    = P1^0; // 8052 only
             
/*  T2CON  */
sbit TF2    = T2CON^7;
sbit EXF2   = T2CON^6;
sbit RCLK   = T2CON^5;
sbit TCLK   = T2CON^4;
sbit EXEN2  = T2CON^3;
sbit TR2    = T2CON^2;
sbit C_T2   = T2CON^1;
sbit CP_RL2 = T2CON^0;


#endif