1602调试程序，适合初学者学习

#include<reg52.h>
#define uchar unsigned char 
#define uint unsigned int
sbit lcdrs=P1^0;
sbit lcden=P1^2;
sbit lcdwr=P1^1;
uchar CGCODE[]={0x08,0x0F,0x12,0x0F,0x0A,0x1F,0x02,0x02,//"年"代码 0x00
   0x0F,0x09,0x0F,0x09,0x0F,0x09,0x13,0x00,//"月"代码 0x01
   0x0F,0x09,0x09,0x0F,0x09,0x09,0x0F,0x00,//"日"代码  0x02
   0x07,0x04,0x07,0x04,0x07,0x00,0x04,0x07,//"星"左上半部分代码 0x03
   0x1F,0x01,0x1F,0x01,0x1F,0x08,0x08,0x1F,//"星"右上半部分代码 0x04
   0x08,0x17,0x00,0x1F,0x00,0x00,0x00,0x00,//"星"左下半部分代码 0x05
   0x08,0x1F,0x08,0x1F,0x00,0x00,0x00,0x00//"星"右下半部分代码 0x06  
   };
uchar tab[]={'0','8',0x00,'0','3',0x01,'0','9',0x02};//显示"08年03月09日"
void delay(uint t)
{
 uint x,y;
 for(x=0;x<t;x++)
  for(y=0;y<110;y++);
}
void write_com(uchar com)//向1602写指令
{
 lcdrs=0;
 P2=com;
 delay(5);
 lcden=1;
 delay(5);
 lcden=0;
}