Lcd Alphanumeric

In: Computers and Technology

Submitted By adivyas
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LCD
The most commonly used LCDs found in the market today are 1 Line, 2 Line or 4 Line LCDs which have only one controller and support at most 80 characters, whereas LCDs supporting more than 80 characters make use of 2 HD44780 controllers. Apart from displaying some simple static characters you can create animated text scripts and a lot more! Let’s start playing with them, but you will have to wait a little as these things mentioned below will help you to create your own magical codes.

Most LCDs with 1 controller has 14 Pins and 16 Pins (two extra pins are for back-light LED connections). Pin description is shown in the table below. (We may also have 16 pins in 2 controllers, refer to the datasheet for exact details).

This may not match with the exact pin configuration for your LCD, check application circuit in datasheet for exact configuration. We will discuss here 8 bit mode first (that is data transfer through all the 8 data pins), 4 bit mode will be discussed later on. Read/Write (RW):

1.) RW= 0, the information is being written on LCD. 2.) RW=1, for reading from LCD. (Only one command that is “Get LCD status” is a read command all others are write command) It is a control line. When RW is low (0), the information on the data bus is being written to the LCD. When RW is high (1), the program is effectively querying (or reading from) the LCD. Only one instruction ("Get LCD status") is a read command. All others are write commands--so RW will be low for majority of the time. Registers: There are two very important registers in the LCD. The RS pin is used for their selection. 1.) RS= 0; The Instruction command code register, allows the user to send command such as clear display, cursor at home, etc. 2.) RS=1; the data register, allow user to send data to be displayed at LCD. Enable (En) pin: is used to tell the LCD that we are sending it data. A high to…...

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