16 x 2 LCD interfacing with AT89V51RD2 microcontroller

 In this tutorial we interface 16x2 LCD with AT89V51RD2 microcontroller. We connect D0-D7 data pins to P1 and RS=P2.0, RW= P2.1, EN=P2.2 of microcontroller. 

Connections:

Program:

#include <reg51.h>

sbit Rs=P2^0;

sbit Rw=P2^1;

sbit EN=P2^2;

void lcd_init();

void lcd_data(char);

void lcd_cmd(char);

void delay(int);

void display (char[]);

void main()

{

int j=1;

lcd_init();

display("Smartronics");

lcd_cmd(0xC0);

display("Solutions");

while(j>0)

{

lcd_cmd(0x1C);

}

}

void display(char a[])

{

int i =0;

while(a[i] != 0)

{

lcd_data(a[i]);

i++;

}

}

void lcd_init()

{

lcd_cmd(0x38);

lcd_cmd(0x01);

lcd_cmd(0x06);

lcd_cmd(0x0f);

lcd_cmd(0x80);

lcd_cmd(0x1c);

}

void lcd_data(char d)

{

P1=d;

Rs=1;

Rw=0;

EN=1;

delay(1);

EN=0;

delay(1);

}

void lcd_cmd(char c)

{

P1=c;

Rs=0;

Rw=0;

EN=1;

delay(1);

EN=0;

delay(1);

}

void delay(int t)

{

int i;

for(i=0;i<1275*t;i++);

}