16x2 LCD interfacing 8051

Component:

1. 8051 Development Board
2. 16x2 Lcd

Get Datasheet:

Download Datasheet form below link

LCD-1602A Datasheet - 16x2 LCD Module - Changsha Sunman - DataSheetCafe.com

Please read important topics from datasheet. 

• Features
• Absolute Maximum
• Electronic Characteristics
• Pin Assignment
• Instruction Table

Photo:

LCD Basic Circuit Diagram

 

LCD and 8051 Pin 8 bit mode Connections

LCD	8051
D0	P0^0
D1	P0^1
D2	P0^2
D3	P0^3
D4	P0^4
D5	P0^5
D6	P0^6
D7	P0^7
RS	P1^0
RW	P1^1
E	P1^2

LCD and 8051 Pin 4 bit mode Connections

LCD	8051
D4	P0^4
D5	P0^5
D6	P0^6
D7	P0^7
RS	P1^0
RW	P1^1
E	P1^2

RS, RW, E, and D0-D7

D0-D7 is represent as 8bit data-bus

RS=0 means instruction or command

RS=1 means data

E = enable or latch the information from data-bus

Instruction or Command of LCD 16x2

Command Hex	Description
1	Clear display screen
2	Return home
4	Decrement cursor (shift left)
6	Increment cursor (shift right)
0x38	2 lines 5x7 matrix
E	Display on cursor blinking
80	1st line position 0
C0	2nd line position 0

LCD 8bit mode Program

programs in different Categories.
#include <reg51.h>
sfr ldata = 0x80; //P0=LCD data pins 
sbit rs = P1^0;
sbit rw = P1^1;
sbit en = P1^2;
 
void ms_delay(unsigned int itime)
{ 
	unsigned int i, j;
	for(i=0;i<itime;i++)
	for(j=0;j<1275;j++); 
}
 
void lcdcmd(unsigned char value)
{
	ldata = value;  //put the value on the pins
	rs = 0;
	rw = 0;
	en = 1; 		//strobe the enable pin
	ms_delay(1); 
	en = 0;
	return;
}
 
void lcddata(unsigned char value)
{ 
	ldata = value; 	//put the value on the pins
	rs = 1;
	rw = 0;
	en = 1; 		//strobe the enable pin
	ms_delay(1);
	en = 0;
	return;
}
 
void lcdstr(char *str)
{
	while(*str)
	{
		lcddata(*str++);
		ms_delay(10);
	}	
}
 
void lcd_init()
{
        lcdcmd(0x38); // 2 line and 5x7 matrix
	ms_delay(10);
	lcdcmd(0x0E); // Display On, cursor blinking
	ms_delay(10);
	lcdcmd(0x01); // clear display
	ms_delay(10);
	lcdcmd(0x06); // Increment cursor (shit to right)
	ms_delay(10);
}
 
void main(){
	lcd_init();
	lcdcmd(0x80); // line 1, position 0
	lcddata('P');
        ms_delay(10);	
	lcddata('M');
	ms_delay(10);
	lcddata('V');
	ms_delay(10);
	lcddata('A'); 
	ms_delay(10);
	lcddata('N');
	ms_delay(10);
	lcddata('K');
	ms_delay(10);
	lcddata('E');
        ms_delay(10);	
	lcddata('R');
	ms_delay(10);
	lcdcmd(0xC0); //line 2, position 0
	ms_delay(10);
	lcdstr("Please Subscribe");
}

LCD 4bit mode Program

programs in different Categories.

#include <reg51.h>
#define lcd P0
sbit RS=P1^0;
sbit RW=P1^1;
sbit EN=P1^2;      
void init_lcd(void);
void cmd_lcd(unsigned char);
void data_lcd(unsigned char);
void str_lcd(char *);
 
void delay_ms(unsigned int itime)
{
     unsigned int i, j; 
     for(i=0;i<itime;i++)
     for(j=0;j<1275;j++);
} 
void init_lcd()
{
	cmd_lcd(0x02);			//4-bit mode
	cmd_lcd(0x28);	
	cmd_lcd(0x80);			//starting pos of 1st line
	cmd_lcd(0x01);			//clear screen
	cmd_lcd(0x0C);			
        cmd_lcd(0x06);
}
void write_lcd(unsigned char ch)
{
	RW=0;
	lcd=(ch & 0xf0);
	EN=1;
	delay_ms(2);
	EN=0;
 
	lcd=(ch<<4);
	EN=1;
	delay_ms(2);
	EN=0;
 
}
 
void cmd_lcd(unsigned char ch)
{
	RS=0;	  
	write_lcd(ch);
}
 
void data_lcd(unsigned char ch)
{
	RS=1;
	write_lcd(ch);	
}
void str_lcd(char *p)
{
	while(*p)
		data_lcd(*p++);
 
}
void main()
{
   init_lcd();
   cmd_lcd(0x80) // line 1 pos 0
   str_lcd("Praful Vanker");
}

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