P89V664 Serial Graphical LCD Problem

Hello

I have confused in the coding of the Serial Graphical LCD on NXP P89V664.

Can any one help ????

the code is

#include<reg52.H>
#include<stdio.h>
#include<intrins.h>

// #define unsigned char unsigned char // 0~255
// #define unsigned int unsigned int   // 0~65535

sbit _CS = P2^3;
sbit _RST = P2^2;
sbit A0 = P2^1;
sbit SCK = P4^0;
sbit DIN = P4^2;

unsigned char ContrastLevel;     // for contrast setting level

//-----------------------------------
// dispaly data (128x64)
//-----------------------------------

unsigned char code Logo[]={

....0x15,0x06,0x00,0x00,0x10,0x1F,0x10,0x00,0x00,0x12,0x15,0x15,0x15,0x88,0xC0
};

//-----------------------------------
// Delay Routine
//-----------------------------------

void delayms(unsigned int m)        // 12MHz Xtal, close to ms value
{
    unsigned int j;
    unsigned int i;

    for(i=0; i<m; i++)
        for(j=0; j<109; j++)
            _nop_();
}

//-----------------------------------
// IO Routine
//-----------------------------------

void lcd_cmd(unsigned char Command)       //send command
{
    SCK = 1;
    A0  = 0;
    _CS = 0;
    DIN = Command & 0x80; SCK= 0; SCK= 1;
    DIN = Command & 0x40; SCK= 0; SCK= 1;
    DIN = Command & 0x20; SCK= 0; SCK= 1;
    DIN = Command & 0x10; SCK= 0; SCK= 1;
    DIN = Command & 0x08; SCK= 0; SCK= 1;
    DIN = Command & 0x04; SCK= 0; SCK= 1;
    DIN = Command & 0x02; SCK= 0; SCK= 1;
    DIN = Command & 0x01; SCK= 0; SCK= 1;
    _CS = 1;
}

void lcd_data(unsigned char DData)        //send data
{
    SCK= 1;
    A0  = 1;
    _CS = 0;
    DIN = DData & 0x80; SCK= 0; SCK= 1;
    DIN = DData & 0x40; SCK= 0; SCK= 1;
    DIN = DData & 0x20; SCK= 0; SCK= 1;
    DIN = DData & 0x10; SCK= 0; SCK= 1;
    DIN = DData & 0x08; SCK= 0; SCK= 1;
    DIN = DData & 0x04; SCK= 0; SCK= 1;
    DIN = DData & 0x02; SCK= 0; SCK= 1;
    DIN = DData & 0x01; SCK= 0; SCK= 1;
    _CS = 1;
}

//-----------------------------------
// Write a Screen
//-----------------------------------
void WriteScreen(unsigned char *DisplayData)    // DisplayData should be 164x64/8 = 1312byte
{
    unsigned char TempData;
    unsigned char i, j;
    for(i=0;i<8;i++)
        {
        lcd_cmd(0xb0 | i);    // select page 0~7
        lcd_cmd(0x10);        // start form column 4
        lcd_cmd(0x00);        // (2byte command)
        for(j=0;j<128;j++)
                {
            TempData=(*(DisplayData+(i*128)+j));
            lcd_data(TempData);
            }
        }
}

//-----------------------------------
// Contrast control
//-----------------------------------
void LCD_Darker(void)
{
    if (ContrastLevel<0x3F)
        {
        ContrastLevel++;
        }
    lcd_cmd(0x81);            // E-Vol setting
    lcd_cmd(ContrastLevel);   // (2byte command)
}



void LCD_Lighter(void)
{
    if (ContrastLevel>0x00)
        {
         ContrastLevel--;
        }
    lcd_cmd(0x81);            // E-Vol setting
    lcd_cmd(ContrastLevel);   // (2byte command)
}


//-----------------------------------
// Init LCD module
//-----------------------------------
void initLCDM(void)
{
    _RST=1;                 // hardware reset LCD module
    _RST=0;
    delayms(1);
    _RST=1;
    delayms(800);

    ContrastLevel=0x17;     // default Contrast Level  1a
    lcd_cmd(0xab);                      //new
    lcd_cmd(0xaf);            // display on
    lcd_cmd(0x40);            // display start line=0
    lcd_cmd(0xc8);            // Common output mode select= reverse
    lcd_cmd(0xa6);            // normal display
    lcd_cmd(0xa4);            // Duisplay all point = off
    lcd_cmd(0xa3);            // LCD bias = 1/9   a2
    lcd_cmd(0x2f);            // Power control = all on
    lcd_cmd(0x25);            // Rab Ratio     26
    lcd_cmd(0x81);            // E-Vol setting
    lcd_cmd(ContrastLevel);   // (2byte command)
}

//-----------------------------------
// Main Program
//-----------------------------------
void main()
{
    SP=0x60;
    EA = 0;         // disable interrupts

    _CS    =1;
    _RST   =1;
    A0     =1;
    SCK   =1;
    DIN    =1;

    initLCDM();
    WriteScreen(Logo);
    while(1)
    {
    }
}
//end of program

The error it shoes that P4 is an undefined identifier. error C202