LCD12864显示器C51编程实例解析

#include <reg52.h>  //我爱
 #define uint unsigned int 
  #define uchar  unsigned char 
   code uchar string[192]={
0x06,0x40,0x38,0x50,0x08,0x48,0x08,0x48,0x08,0x40,0xFF,0xFE,0x08,0x40,0x08,0x48,
0x0E,0x28,0x38,0x30,0xC8,0x20,0x08,0x50,0x09,0x92,0x08,0x0A,0x28,0x06,0x10,0x02,
0x00,0xF8,0x3F,0x90,0x12,0x10,0x09,0x20,0x3F,0xFE,0x22,0x02,0x42,0x00,0x3F,0xFC,
0x04,0x00,0x07,0xF0,0x0C,0x20,0x0B,0x40,0x10,0xC0,0x63,0x30,0x8C,0x0E,0x30,0x04,
0x02,0x00,0x01,0x00,0x7F,0xFE,0x40,0x04,0x80,0x08,0x3F,0xF8,0x01,0x00,0x01,0x00,
0x01,0x00,0x1F,0xF8,0x01,0x40,0x01,0x20,0x01,0x30,0x01,0x20,0x7F,0xFE,0x00,0x00,
 0x00,0x00,0x1F,0xF0,0x10,0x10,0x10,0x10,0x11,0x10,0x11,0x10,0x11,0x10,0x11,0x10,
0x11,0x10,0x11,0x10,0x11,0x10,0x02,0x80,0x04,0x60,0x18,0x18,0x60,0x08,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,
0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x00,0x00,0x10,0x00,0x00,0x00,
0x00,0x00,0x0F,0x38,0x1F,0xFC,0x1F,0xFE,0x3F,0xFF,0x3F,0xFF,0x3F,0xFF,0x3F,0xFF,
0x3F,0xFF,0x1F,0xFE,0x0F,0xFC,0x07,0xF8,0x03,0xF0,0x00,0xC0,0x00,0x00,0x00,0x00
};
 

  sbit cs=P2^0;
  sbit rst=P2^1;
  sbit ao=P2^2;
  sbit wr=P2^3;
  sbit ep=P2^4;
 void  delay(uint x)  //延时
 {
  uint a,b;
   for(a=x;a>0;a--)
     for(b=1;b>0;b--);
 }

wrcmdd(uint cmd)   // 写指令
{
ao=0;
wr=0;
ep=1;
cs=0;
P0=cmd;
delay(7);
ep=0;
cs=1;
}

wrdatee(uint dat) //写数据
{
ao=1;
wr=0;
ep=1;
cs=0;
P0=dat;
delay(7);
ep=0;
cs=1;
}


 readdd()    //读
 {
uint fff;