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Mar 25, 2018 - Is an inevitable part in almost all embedded projects and this article is about interfacing a 16×2 LCD with. Many guys find it hard to interface.
Display units are the most important output devices in embedded projects and electronics products. 16x2 LCD is one of the most used display unit.
16x2 LCD means that there are two rows in which 16 characters can be displayed per line, and each character takes 5X7 matrix space on LCD. In this tutorial we are going to connect to the 8051 microcontroller (AT89S52). Interfacing LCD with 8051 microcontroller might look quite complex to newbies, but after understanding the concept it would look very simple and easy.
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Although it may be time taking because you need to understand and connect 16 pins of LCD to the microcontroller. So first let's understand the 16 pins of LCD module. We can divide it in five categories, Power Pins, contrast pin, Control Pins, Data pins and Backlight pins.
Category Pin NO. Pin Name Function Power Pins 1 VSS Ground Pin, connected to Ground 2 VDD or Vcc Voltage Pin +5V Contrast Pin 3 V0 or VEE Contrast Setting, connected to Vcc thorough a variable resistor. Control Pins 4 RS Register Select Pin, RS=0 Command mode, RS=1 Data mode 5 RW Read/ Write pin, RW=0 Write mode, RW=1 Read mode 6 E Enable, a high to low pulse need to enable the LCD Data Pins 7-14 D0-D7 Data Pins, Stores the Data to be displayed on LCD or the command instructions Backlight Pins 15 LED+ or A To power the Backlight +5V 16 LED- or K Backlight Ground All the pins are clearly understandable by their name and functions, except the control pins, so they are explained below: RS: RS is the register select pin. We need to set it to 1, if we are sending some data to be displayed on LCD. And we will set it to 0 if we are sending some command instruction like clear the screen (hex code 01).
RW: This is Read/write pin, we will set it to 0, if we are going to write some data on LCD. And set it to 1, if we are reading from LCD module. Generally this is set to 0, because we do not have need to read data from LCD. Only one instruction “Get LCD status”, need to be read some times.
E: This pin is used to enable the module when a high to low pulse is given to it. A pulse of 450 ns should be given. That transition from HIGH to LOW makes the module ENABLE.
There are some preset command instructions in LCD, we have used them in our program below to prepare the LCD (in lcd_init() function).