If you want to know the fundamentals and internal operation of LCD Modules I would recommend visiting these links : More specifically the it is executed at the falling edge of the pulse. Each Data/Instruction is executed by the LCD module only when a pulse is applied to Enable pin.

Enable (Control Pin) : This is similar to a trigger pin.Caution : If you are planning to use Read Mode with 3.3V MCUs you’ll need a Bi-directional level shifter which can shift 5V to 3.3V and Vice-Versa. Since we are going to use Write Mode only we will permanently ground it using a pull-down resistor of 4.7K Ohms. R/W – Read or Write (Control Pin): R/W = High for Read Mode and R/W = Low for Write.RS = High for Instruction Mode and RS = Low for Data mode. RS – short for Register select (Control Pin) : Used to switch been Instruction and Data Mode.That gives the best contrast of what I’ve seen. Contrast Voltage (VEE) : Instead of using a trim pot just connect a 1K resistor to VEE in series and ground it.Now lets see some of the important pins before we actually start writing programs for LCD:

To keep things simple lets group the pins into 3 :

2) Data Mode : Displays the respective characters for codes supplied to it via Data Pins.

1) Instruction Mode : Used for initializing and configuring LCD before we can use it & during operation.

It Consists of 2 Rows with 16 Characters on each. This particular chinese LCD i.e JHD162A has KS0066U controller or similar to the famous HD44780U. at the moment lets get started with the basics. The pic below shows the LPC2148 development board interfaced with JHD162A LCD Module via 2x HCF4050B ICs. The Data sheet for JHD-162A 16X2 LCD Module is located at : I would strongly suggest that you keep that datasheet open when reading this article to avoid any sort of confusion.īefore Starting the Tutorial, as a motivation, I would like to show the final outcome of this tutorial. for lpc214x, lpc176x.įor this article I’ve used the readily available Chinese 16X2 LCD Module : JHD-162A. And more tutorials on Timer, PWM, UART. Whats next? : A simple Library for LCD interfacing with LPC214x and LPC176x MCUs. As per request by some of the readers of previous articles on lpc2148 this article is on Interfacing a 5V LCD Module with LPC2148 MCU and in general for any ARM or 3.3V MCU. Interfacing a 16X2 or 16X4 LCD module with a 3.3V MCU is not same as interfacing with MCUs like AVR which operate on 5Volts.

Lpc2148 library for proteus 8