ABSTRACT:

16X2 LCD INTERFACING IN 8 BIT METHOD

Now-a-days very important to keep a track of the working of almost all the automated

and semi-automated devices, be it a washing machine, an autonomous robot or anything else.

This is achieved by displaying their status on a small display module. LCD (Liquid Crystal

Display) screen is such a display module and a 16x2 8bit LCD module is very commonly used.

These modules are replacing seven segments and other multi segment LEDs for these

purposes. The reasons being: LCDs are economical, easily programmable, have no limitation of

displaying special & even custom (unlike in seven segments), animations and so on. LCD can be

easily interfaced with a microcontroller to display a message or status of a device. This topic

explains the basics of a 16x2 LCD and how it can be interfaced with AT89S51 to display a

character.

This application note describes a simple technique to display characters from both the

internal character generator and user designed characters on an LCD character module. The

controlling microcontroller is a Atmel 89S52.

Frequently, an AT89S52 program must interact with the outside world using input and

output devices that communicate directly with a human being. One of the most common devices

attached to an AT89S52 is an LCD display. Some of the most common LCDs connected to the

AT89S52 are 16x2 and 20x2 displays. This means 16 characters per line by 2 lines and 20

characters per line by 2 lines, respectively.

Fortunately, a very popular standard exists which allows us to communicate with the vast

majority of LCDs regardless of their manufacturer.

BLOCK DIAGRAM:

HARD WARE: Micro controller

16x2 LCD display Crystal oscillator Reset circuitSoft ware: Keil

Embedded C

Express PCB ADVANTAGES: LOW COST

AUTOMATED OPERATION

LOW POWER CONSUMPTION

VERY FLEXIBLE

EASY TO MANUFACTUR

APPLICATIONS: Used in schools Used in colleges

Used in offices

Applications

MPMC4

No

RESET CKT

CRYSTAL OSCILLATOR

16X2 DISPLAY

AT89S52

MICRO CONTROLLER