In this tutorial we will see how to interface a 16×2 LCD with ARM7-LPC microcontroller and display a simple welcome message. presented in this paper is the interfacing of LCD with ARM controller LPC to display a suitable text message on the. LCD. The text message ‚ÄúDYNAMIC. I think there is no more need to introduce how to interface LCD with microcontroller because we earlier learnt it. So in this module we learn how to interface LCD.

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It is still ok to send the data before these signals. This pin referred as Register Select RS.

The LCD can work in two different modes, namely the 4-bit mode and the 8-bit mode. In four bit mode we can save 4 pins of microcontroller and also reduce the wiring overhead.

Although LCD is slow, it is able to finish executaion of command within few machine cycles. Well if LCD is output device so where we have to read it? These are data pins. Pin 14 is used as busy flag. What is Web Browser. Have an opinion, suggestion lp2148, question or feedback about the article let it out here!

Let us start with basics of LCD. As shown in the timing diagram the data is written after sending the RS and RW signals. While operating in data mode, we must keep in mind that the pattern to be displayed on dot matrix is already stored in internal memory of LCD.


LCD is slow compared to Microc-controllers and it needs time to perform the operations. This high-density System-in-Package SiP integrates controller, power switches, and support components.

Interfacing LCD with ARM(LPC21XX) in 4-bit mode

It is given below. Advantage of LCD over LEDs is its ability to display any number, alphabet, special characters and user defined symbol at extra effort for programming without increasing number of pins required to be connected with controller.

Almost all embedded product requires LCD. Get Our Weekly Newsletter!

Interfacing LCD with LPC 2148

Inteerfacing str [ k ]. That means we must power the board from external 5V supply. Once the operation is completed, it will bring it down. Register Username Email Yes, add me to your mailing list. Here in this project we will use the most commonly used mode which is 4-bit mode.

The complete code for interfacing LCD with ARM 7 is given at the end of intwrfacing tutorial, here we are explaining few parts of it. After including these files, the only thing you got to do is to configure the PORTs in lcd.

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interfacing LCD in 4 bit mode ARM LPC

This pin is used to send the enable trigger to LCD. Download the complete project folder from this link. In this, MSB of data pins ie. Initializing LCD in 4-bit mode. Retrieved interfacinng ” https: Connections of LCD with microcontroller are shown in circuit diagram of next tab. As provided earlier, LCD has 8 data pins and 3 control pins.


A potentiometer is used to vary the contrast of LCD display. Once LCD will start performing and actions, it will raise pin 14 high to indicate that it is in busy state.

Interfacing LCD with LPC | EngineersGarage

You can check out this in the video given at the end. This requires lccd shifter circuit to be interfaced.

First let’s see the timing diagram for sending the data and the command signals RS,RW,ENaccordingly, we write the algorithm and finally the code. To avoid this, LCD has one method known as busy flag. Display not only shows the control options to operate the machine but also shows the status and output of task performed by that machine.