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Simple 8 bit 16x2 LCD interfacing with PIC 16FLike 12 0 Recommend this on Google

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Control Signals

RS- Register Select

There are 2 very important registers in LCD

Command Code register

Data Register

If

RS=0 Instruction command Code register is selected, allowing user to send command

RS=1 Data register is selected allowing to send data that has to be displayed.

R\W- Read\Write

R\W input allows the user to write information to LCD or read information from it. How do we

read data from LCD????? The data that is being currently displayed will be stored in a buffer

memory DDRAM. This data could be read if necessary.

If

R\W=0 Reading

R\W=1Writing

E- Enable

The enable Pin is used by the LCD to latch information at its data pins. When data is supplied to

data pins, a high to low pulse must be applied to this pin in order for the LCD to latch the data

present in the data pins.

E Toggle

Data Bus- D0-D7

Power for Backlighting LEDs

VDD-Power 5V

Vss-GND

General Explanation

We have to prepare an LCD properly before the character we need, has to be displayed. For this a

number of commands have to be provided to the LCD before inputting the required data. The

commands will be discussed in the later part of this tutorial.

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LCD doesnt know about the content (data or commands) supplied to its data bus. It is the user

who has to specify whether the content at its data pins are data or commands. For this, if a

command is inputted then a particular combination of 0s and 1s has to be applied to the Control

lines so as to specify it is a Command on the other hand if a data is inputted at the data lines then

an another combination of 0s and 1s has to be applied to the control lines to specify it is Data.

(Hope you are not confused!!!!). The combinations are as follows-

If

Command RS=0, R\W=0, E=1\0

Data RS=1, R\W=0, E=1\0

Various Commands used in LCDs

Interfacing with PIC

Here 2 ports PORT B and PORT C of PIC 16F877A is taken. PORT B is used for providing control

signals and PORT C is used for providing Data signals.

Of which pins of PORT B are specified as below.

RB0 RS




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RB1 R\W

RB2 E

Programming Steps

Before sending Data to be Displayed to the LCD, it should be prepared to

hold that particular value.

For this certain initializations are to be done as per the Instructions.

Move Value 0X38, 3 times.( Applied max 3 times due to rise time factor) Move Value 0X06, 1 time.

Move Value 0X0F, 1 time.

After each initializations command function and delay should be called.

After Initialization Move Data to the LCD

Call the Data Function and delay.

( 2 functions , one for command and the other for data is being written for the simplicity of the

program)

Program

#include"pic.h"

#include"delay.h"

void main()

{

void command(); //function for command manipolation

void data(); //function for data manipulation

int i;

char a[ ]={"bOtskOOl-hari"};

TRISC=0X00; //Made Port C Out put port (to use with in main function)

TRISB=0X00; //Made Port B output port (to use with outer function)

DelayMs(1);

PORTC=0X38; //to select the mode of the LED 0X38 - 8 bit 2 lines

command(); // Call command function, shows that the given values are commands and not datas

DelayMs(1);

PORTC=0X38; //to select the mode of the LED 0X38 - 8 bit 2 lines

command(); // Call command function

DelayMs(1);

PORTC=0X06; // to activate entry mode

command();

DelayMs(1);

PORTC=0X0F; //to get a blinking curser display

command();

DelayMs(1);

for(i=0;i


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data(); //To show that the given values are data

DelayMs(1);

}

while(1);

}

void command() //command function definition

{

RB0=0;

RB1=0;

RB2=1;

DelayUs(1);

RB2=0;

}

void data() //data function definition

{

RB0=1;

RB1=0;

RB2=1;

DelayUs(1);

RB2=0;

}

PIC SIMULATOR IDE VIEW

- HARI

[email protected]

www.haripanangad.co.cc

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Submitted by claudio1971 on Thu, 2012-12-13 19:53. #1

Member since:13 December 2012

Last activity:18 weeks 15 hours

Submitted by HARI on Sat, 2009-05-02 15:28. #2

Member since:10 March 2009

Last activity:3 years 34 weeks

Submitted by shobhitkukreti on Sat, 2009-05-02 12:49. #3

Member since:28 April 2009

Last activity:3 years 2 weeks

Tags: Electronics

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Comments

Hi i try to write your code successfully , i want create my own application

for lcd , i have just a question : how can i set line 2? you repeat just 2

times 0x38 but some display require 3 times , there is a reason for it? (to

me work properly)

Thank's :)

claudio


Its HITECH PIC C


Which compiler have you utilised ?


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