Introduction 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. 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. Whats next?: A simple Library for LCD interfacing with LPC214x and LPC176x MCUs. And more tutorials on Timer, PWM, UART.
LCD with PIC16F877. Dec 19, 2012 - A simple Library for LCD interfacing with LPC214x and LPC176x. 2) Data Mode: Displays the respective characters for codes. Now lets see some of the important pins before we actually start writing programs for LCD.
For lpc214x, lpc176x. For this article I’ve used the readily available Chinese 16X2 LCD Module: JHD-162A. 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. Before Starting the Tutorial, as a motivation, I would like to show the final outcome of this tutorial. The pic below shows the LPC2148 development board interfaced with JHD162A LCD Module via 2x HCF4050B ICs. I’ll come to HCF4050B IC shortly. At the moment lets get started with the basics.
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16X2 LCD Basics: This particular chinese LCD i.e JHD162A has KS0066U controller or similar to the famous HD44780U. It Consists of 2 Rows with 16 Characters on each. It has a 16 pin Interface. Operates on 5V and has LED backlight. Works in 2 Modes: • 1) Instruction Mode: Used for initializing and configuring LCD before we can use it & during operation.
• 2) Data Mode: Displays the respective characters for codes supplied to it via Data Pins. Standard Pinout is as follows: To keep things simple lets group the pins into 3: 1) Power Pins: Pin 1,2,3,15,16 2) Control Pins: Pin 4,5,6 3) Data Pins: Pin 7 to 14.
Now lets see some of the important pins before we actually start writing programs for LCD: • Contrast Voltage (VEE): Instead of using a trim pot just connect a 1K resistor to VEE in series and ground it. That gives the best contrast of what I’ve seen. • RS – short for Register select (Control Pin): Used to switch been Instruction and Data Mode. RS = High for Instruction Mode and RS = Low for Data mode. • R/W – Read or Write (Control Pin): R/W = High for Read Mode and R/W = Low for Write. Since we are going to use Write Mode only we will permanently ground it using a pull-down resistor of 4.7K Ohms. 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.
• Enable (Control Pin): This is similar to a trigger pin. Each Data/Instruction is executed by the LCD module only when a pulse is applied to Enable pin.
More specifically the it is executed at the falling edge of the pulse. If you want to know the fundamentals and internal operation of LCD Modules I would recommend visiting these links: • • • (Covers a lot of basics.
I found it really helpful.) Interfacing 5V LCD Module with lpc214x: 5V LCD wont operate on 3.3V and also since lpc214x runs on 3.3V and 5Volts might fuse some of its GPIO pin we are gonna need a level shifter or translator that can shift 3.3Volts to 5Volts for LCD Module to be safe. Vikram Sharma M. Has successfully interfaced JHD162A with MSP430 MCU using CD4050B IC as explained in his post @. Some of the buffers / level shifters than can be used are: SN74AHC244N, SN74AC241N, CD74AC244E, CD4050B, etc. Out of which CD4050B is readily available. I purchased a few HCF4050 which is same as CD4050B except it is manufactured by ST Microelectronics and not Texas Instruments.
HCF4050B is a non-inverting Hex Buffer. In our case we’ll be needing 2 of them at minimum since we are going to use 8+2=10 pins from MCU which need to be shifted to 5Volts. There are going to be 8 Data pins and 2 control pins connected from MCU to the LCD Module using 2x HCF4050B. NOTE: As far as possible use the 1st eight consecutive pins(at any cost!) from any port of the MCU as Data Pins which will make sending character data or commands(Instructions) to LCD very easy. In our case we will use P0.0 to P0.7 as data pins and P1.16 as RS pin and P1.17 as Enable pin.
Connections from lpc214x to LCD module will be as shown below. I’ve also made a PCB for the schematic if bread-board is not your cup of tea.(Frankly, since I was running out of time I did it using a bread-board. If some one is having any problems with PCB please let me know.). Initializing LCD Module: After you have cross-checked all your connections from MCU to HFC4050 to LCD Module its time now to Display text on LCD.
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But before that we need to initialize the LCD properly. Also NOTE that: as per the Datasheet – before initializing LCD we need to wait for a minimum time of about 15ms after the input voltage supply is stable and >4.5Volts. The 1st thing required for this is that RS must be held LOW and Enable also LOW in the beginning. Now we must supply some commands using the Data Pins to LCD. But this command wont be executed until we supply a pulse to Enable Pin.
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