打开【lcd12864.h】看看，是不是不适合采用高端区（特殊寄存器）的位，或与之有矛盾。

关键字“hdata”

#ifndef _LCD12864_H_ #define _LCD12864_H_  #include <reg51.h>  #define uint unsigned int #define uchar unsigned char          #define lcd12864_D P0 sbit lcd12864_E = P2^2; sbit lcd12864_RS = P2^0; sbit lcd12864_RW = P2^1; sbit lcd12864_PSB = P2^4; sbit lcd12864_RST = P2^3;  extern unsigned char com; extern unsigned char dat; extern unsigned char ms;  void delayms(uint ms); void lcd12864_Com_write(uchar com); void lcd12864_Data_write(uchar dat); void lcd12864_display(uchar code *s); void lcd12864_Init();  #endif