How to controle LCD widh Pic 16f877

By: Unknown on 1/22/2016 11:44:00 AM

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How to controle LCD widh Pic 16f877

Introduction

The most commonly used Character based LCDs are based on Hitachi's HD44780 controller or other which are compatible with HD44580. In this tutorial, we will discuss about character based LCDs, their interfacing with various microcontrollers, various interfaces (8-bit/4-bit), programming, special stuff and tricks you can do with these simple looking LCDs which can give a new look to your application.

For Specs and technical information HD44780 controlle

Pin Description

The most commonly used LCDs found in the market today are 1 Line, 2 Line or 4 Line LCDs which have only 1 controller and support at most of 80 charachers, whereas LCDs supporting more than 80 characters make use of 2 HD44780 controllers.

Most LCDs with 1 controller has 14 Pins and LCDs with 2 controller has 16 Pins (two pins are extra in both for back-light LED connections). Pin description is shown in the table below

Pin No.	Name	Description
1	D7	Data bus line 7 (MSB)
2	D6	Data bus line 6
3	D5	Data bus line 5
4	D4	Data bus line 4
5	D3	Data bus line 3
6	D2	Data bus line 2
7	D1	Data bus line 1
8	D0	Data bus line 0 (LSB)
9	EN1	Enable signal for row 0 and 1 (1stcontroller)
10	R/W	0 = Write to LCD module 1 = Read from LCD module
11	RS	0 = Instruction input 1 = Data input
12	VEE	Contrast adjust
13	VSS	Power supply (GND)
14	VCC	Power supply (+5V)
15	EN2	Enable signal for row 2 and 3 (2ndcontroller)
16	NC	Not Connected
Table 2: Character LCD pins with 2 Controller

simulation :

programmation :

#include <16F877.h>

#device adc=10

#fuses HS,NOWDT,NOPROTECT,NOLVP

#use delay(clock=20000000)                                           

#include "LCD.c"                                                                         

#define LCD_ENABLE_PIN  PIN_B0                                    ////

#define LCD_RS_PIN      PIN_B1                                    ////

#define LCD_RW_PIN      PIN_B2                                    ////

#define LCD_DATA4       PIN_B4                                    ////

#define LCD_DATA5       PIN_B5                                    ////

#define LCD_DATA6       PIN_B6                                    ////

#define LCD_DATA7       PIN_B7                                       

void main() {                                                                 

lcd_init(); 

while(1){                          // boucle infinie

lcd_gotoxy(1,1);

printf(lcd_putc,"Smart_Tech Naim");   //Ecrire sur l'ecran lcd 

  lcd_gotoxy(1,2);

printf(lcd_putc,"smart-tech-med-naim");

  

}                       

}