Useing the 2.4 inch TFT LCD , which is used ILI9325 controller , 65K color , 320*240 (resolution).
Connect the pins to Arduino
DB0-DB16 to pin D0-D13 , pin A0-A1 of Arduino
RESET to A2
CS to A3
WR to A4
RS to A5
Use the 16 bit data bus which is 2 timer faster than 8 bit. but it used up all the pins of the Arduino.
#define LCD_RS 19
#define LCD_REST 16
#define LCD_WR 18
#define LCD_CS 17
void main_Write_COM(int DH)
{
unsigned char i;
int temp;
digitalWrite(LCD_RS,LOW);
digitalWrite(LCD_CS,LOW);
for(i=0;i<16;i++)
{
temp=(DH&0x01);
if(temp)
digitalWrite(i,HIGH);
else
digitalWrite(i,LOW);
DH=DH>>1;
}
digitalWrite(LCD_WR,LOW);
digitalWrite(LCD_WR,HIGH);
digitalWrite(LCD_CS,HIGH);
}
void main_Write_DATA(int DH)
{
unsigned char i;
int temp;
digitalWrite(LCD_RS,HIGH);
digitalWrite(LCD_CS,LOW);
for(i=0;<16;i++)
{
temp=(DH&;0x01);
if(temp)
digitalWrite(i,HIGH);
else
digitalWrite(i,LOW);
DH=DH>>1;
}
digitalWrite(LCD_WR,LOW);
digitalWrite(LCD_WR,HIGH);
digitalWrite(LCD_CS,HIGH);
}
void main_W_com_data(int com1,int dat1)
{
main_Write_COM(com1);
main_Write_DATA(dat1);
}
void address_set(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
main_W_com_data(0x0002,x1>>8); // Column address start2
main_W_com_data(0x0003,x1); // Column address start1
main_W_com_data(0x0004,x2>>8); // Column address end2
main_W_com_data(0x0005,x2); // Column address end1
main_W_com_data(0x0006,y1>>8); // Row address start2
main_W_com_data(0x0007,y1); // Row address start1
main_W_com_data(0x0008,y2>>8); // Row address end2
main_W_com_data(0x0009,y2); // Row address end1
main_Write_COM(0x0022);
}
void main_init(void)
{
digitalWrite(LCD_REST,HIGH);
delay(5);
digitalWrite(LCD_REST,LOW);
delay(10);
digitalWrite(LCD_REST,HIGH);
delay(20);
// VENDOR
main_W_com_data(0x0046,0x00A4);
main_W_com_data(0x0047,0x0053);
main_W_com_data(0x0048,0x0000);
main_W_com_data(0x0049,0x0044);
main_W_com_data(0x004a,0x0004);
main_W_com_data(0x004b,0x0067);
main_W_com_data(0x004c,0x0033);
main_W_com_data(0x004d,0x0077);
main_W_com_data(0x004e,0x0012);
main_W_com_data(0x004f,0x004C);
main_W_com_data(0x0050,0x0046);
main_W_com_data(0x0051,0x0044);
//240x320 window setting
main_W_com_data(0x0002,0x0000); // Column address start2
main_W_com_data(0x0003,0x0000); // Column address start1
main_W_com_data(0x0004,0x0000); // Column address end2
main_W_com_data(0x0005,0x00ef); // Column address end1
main_W_com_data(0x0006,0x0000); // Row address start2
main_W_com_data(0x0007,0x0000); // Row address start1
main_W_com_data(0x0008,0x0001); // Row address end2
main_W_com_data(0x0009,0x003f); // Row address end1
// Display Setting
main_W_com_data(0x0001,0x0006); // IDMON=0, INVON=1, NORON=1, PTLON=0
main_W_com_data(0x0016,0x00C8); // MY=0, MX=0, MV=0, ML=1, BGR=0, TEON=0 0048
main_W_com_data(0x0023,0x0095); // N_DC=1001 0101
main_W_com_data(0x0024,0x0095); // PI_DC=1001 0101
main_W_com_data(0x0025,0x00FF); // I_DC=1111 1111
main_W_com_data(0x0027,0x0002); // N_BP=0000 0010
main_W_com_data(0x0028,0x0002); // N_FP=0000 0010
main_W_com_data(0x0029,0x0002); // PI_BP=0000 0010
main_W_com_data(0x002a,0x0002); // PI_FP=0000 0010
main_W_com_data(0x002C,0x0002); // I_BP=0000 0010
main_W_com_data(0x002d,0x0002); // I_FP=0000 0010
main_W_com_data(0x003a,0x0001); // N_RTN=0000, N_NW=001 0001
main_W_com_data(0x003b,0x0000); // P_RTN=0000, P_NW=001
main_W_com_data(0x003c,0x00f0); // I_RTN=1111, I_NW=000
main_W_com_data(0x003d,0x0000); // DIV=00
delay(1);
main_W_com_data(0x0035,0x0038); // EQS=38h
main_W_com_data(0x0036,0x0078); // EQP=78h
main_W_com_data(0x003E,0x0038); // SON=38h
main_W_com_data(0x0040,0x000F); // GDON=0Fh
main_W_com_data(0x0041,0x00F0); // GDOFF
// Power Supply Setting
main_W_com_data(0x0019,0x0049); // CADJ=0100, CUADJ=100, OSD_EN=1 ,60Hz
main_W_com_data(0x0093,0x000F); // RADJ=1111, 100%
delay(1);
main_W_com_data(0x0020,0x0040); // BT=0100
main_W_com_data(0x001D,0x0007); // VC1=111 0007
main_W_com_data(0x001E,0x0000); // VC3=000
main_W_com_data(0x001F,0x0004); // VRH=0011
//VCOM SETTING
main_W_com_data(0x0044,0x004D); // VCM=101 0000 4D
main_W_com_data(0x0045,0x000E); // VDV=1 0001 0011
delay(1);
main_W_com_data(0x001C,0x0004); // AP=100
delay(2);
main_W_com_data(0x001B,0x0018); // GASENB=0, PON=0, DK=1, XDK=0, VLCD_TRI=0, STB=0
delay(1);
main_W_com_data(0x001B,0x0010); // GASENB=0, PON=1, DK=0, XDK=0, VLCD_TRI=0, STB=0
delay(1);
main_W_com_data(0x0043,0x0080); //set VCOMG=1
delay(2);
// Display ON Setting
main_W_com_data(0x0090,0x007F); // SAP=0111 1111
main_W_com_data(0x0026,0x0004); //GON=0, DTE=0, D=01
delay(1);
main_W_com_data(0x0026,0x0024); //GON=1, DTE=0, D=01
main_W_com_data(0x0026,0x002C); //GON=1, DTE=0, D=11
delay(1);
main_W_com_data(0x0026,0x003C); //GON=1, DTE=1, D=11
// INTERNAL REGISTER SETTING
main_W_com_data(0x0057,0x0002); // TEST_Mode=1: into TEST mode
main_W_com_data(0x0095,0x0001); // SET DISPLAY CLOCK AND PUMPING CLOCK TO SYNCHRONIZE
main_W_com_data(0x0057,0x0000); // TEST_Mode=0: exit TEST mode
//main_W_com_data(0x0021,0x0000);
main_Write_COM(0x0022);
}
void Pant(unsigned int color)
{
int i,j;
address_set(0,0,239,319);
for(i=0;i<320;i++)
{
for (j=0;j<240;j++)
{
main_Write_DATA(color);
}
}
}
void setup()
{
unsigned char p;
for(p=0;p<20;p++)
{
pinMode(p,OUTPUT);
}
main_init();
}
void loop()
{
Pant(0xf800); //Red
delay(1000);
Pant(0X07E0); //Green
delay(1000);
Pant(0x001f); //Blue
delay(1000);
}
More information about the demo code and the screen :
http://iteadstudio.com/application-note/itdb02-2-4-display-with-arduino
I am going to write a library for this controller , and there are the 2.4 and 3.2 inch LCD use the same controller that can use this library 
Mega has enough I/O for the LCD ,touch , SDcard even the external flash .