4 bit lcd

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Why LCD 4-Bit Operation

Circuit

Flow Chart

Code in C

Download Code

LCD 4-BIT OPERATION

In the recent years LCD, is finding in daily use replacing LEDs which may be

Single, Seven Segment or Multi Segment LEDs Because of Declining Pricing

of LCD and ability to display numbers, characters and graphics. Another

advantage of LCD is that, Incorporation of refreshing controller in to LCD for

relieving the CPU of the task of refreshing LCD.

Download Code (KEIL Project) (Zip Format)

Liquid Crystal Display LCD 4-Bit Operation

Interface LCD in 4 bit mode, LCD in 4 bit mode, Interfacing LCD with microcontroller

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Why LCD 4-Bit Operation?

You may be Surprised why we using LCD in 4-Bit Mode and How its Possible? LCD in 4-Bit means we are 4 Lines of data bus instead

of using 8 Line data bus. In this Method, we are Splitting Bytes of data in Nibbles. If you successfully interface Microcontroller with LCD

with 4 Pins. Then we can save 4 Lines of Microcontroller, which pins we can used for other purpose. In this Artic le we are using 16 x 2

LCD. Same Process in Repeated For all Type of Character LCDs expect Minor Changes

Circuit

Pic of circuit

How to initialize LCD in 4 bit mode

Lcd is initialize in 4 bit mode. For that 0x30 is the be written 3 times on lcd.

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LCD Pin Description

Flow Chart

Pin No Symbol I/O Description

1 Vss - Ground

2 Vcc +5V

3 Vee Contrast Control

4 RS Input Command/Data Register

5 R/W Input Read/Write Register

6 E Input/Output Enable

7 DB0 Input/Output Not Used in 4-Bit Mode


9DB2 Input/Output Not Used in 4-Bit Mode


11 DB4 Input/Output Data Bus in 4-Bit Mode




15 Vcc - For LCD Back Light

16 Vss - For LCD Back Light

Code in C

#include

#include

#define LCDPORT P2

sbit RS=LCDPORT^0;

sbit RW=LCDPORT 1;

sbit E =LCDPORT 2;

bit status=0;

#define lcd_delay 400

/*

* Function Name : delay

* Input : value

* Output : None

Download Code (KEIL Project) (Zip Format)

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* Description : This Function Gives Approximate Delay required For LCD Intilization

*/

void delay(unsigned int j )

{

unsigned int i=0;

for(i=0;i

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lcd_com(1);

delay(lcd_delay);

}

/*

* Function Name : lcd_puts

* Input : String

* Output : String

* Description : Display String on LCD

*/

void lcd_puts(char *str)

{

unsigned int i=0;

for(;str[i]!=0;i++)

lcd_data(str[i]);

}

/*

* Function Name : Main* Input : None

Output : None

* Description : Disp lay Character on LCD at Proper Location

*/

void m ain()

{

lcd_ini t(); //Intilize LCD in 4-Bit Mode

lcd_com (0X80); // Start Cursor From First Line

lcd_puts ("Hello"); //Print HELLO on LCD

lcd_com (0XC0); // Start Cursor From Second Line

lcd_puts("World"); //Print HELLO on LCD

while(1 ); //Stay Forever Here

}

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4 bit lcd