Features. Implements the industry standard Hitachi HD LCD display driver chip protocol; Requires only seven I/O pins on one I/O port. Download the Hitachi HD LCD Controller Datasheet and browse our LCDs that use this controller. Version HDU (LCD-II) (Dot Matrix Liquid. introduction to Hitachi HD LCD module, pinout pin detials,instructions set, commands for HD lcd interfacing with microcontroller.

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You will notice that pin 5 RW is tied to ground.

HD44780 Character LCD Displays – Part 1

Remember Me Lost your password? For this exercise we will use just a series of switches. DDRAM content remains unchanged.

You can use this information to display a horizontal bar graph. The module that we are using is a 16 character x 2 line display that we stock over here.

Download the Hitachi HD44780 LCD Controller Datasheet

The Hitachi HD has many commands, Here are the most useful: You can get many different screen sizes e. The HD is capable of operating in 8 bit mode i. These characters have to be written to the device each time it is switched on, as they are stored in volatile memory. I promise to use it only to send you MicroZine. The enable button has a 10nF capacitor to de-bounce it.

Click on a table to get a larger view. Two versions of the ROM have been developed: By using this site, hitaci agree to the Terms of Use and Privacy Policy. HD based display modules also have a 4 bit interface mode. The following example uses the print command to continuously output an updated time display every 99ms. This bitachi be discussed in more detail below.


This tutorial will teach you the basics of interfacing with a HD compatible display using some DIP switches and a few other components.

Sanchez, Julio; Canton, Maria P. The most commonly manufactured larger configuration is 40×4. No reprodction without permission. Leave a reply Click here to cancel the hittachi Your email address will not be published.

A limited number of custom characters can be programmed into the device in the form of a bitmap using special commands. The Register Select and data lines are pulled down using a 10K resistor and when the dip switch is closed, those lines go high.

It shows how that to make code generalised and easy to use there is a sacrifice in performance. Sending Data and Commands Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4. Go to the shop.

HD Character LCD Displays – Part 1 – Protostack

The RS lines tells the module whether the 8 447880 bits relate to data or a command. Returns cursor to home position. Those without backlights may have only 14 pins, omitting the two pins powering the light. Don’t worry — youre-mail address is totally secure. The main benefit of the 4 bit mode is that less data lines are required. Comments Have your say about what you just read! How to use the BMP for weather pressure measurement or altitude change detection. Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4.


There are two primary considerations. Pinout The module that we are using is a 16 character x 2 line display that we stock over here. This pattern is the default pattern for an uninitialized LCD display. This is also used to initialise internal data structures with the pins in use.

The way it is done here is “safe” but gives a big performance hit at each lcd write operation. This is shown in the photo below. Click in the code for the Hitach HD to copy it to the clipboard. First of all the pin mode is set every time that a write is made to the LCD.

State3 may higachi, for example, if a prior control was aborted after sending only the first 4 bits of a command while the LCD was in 4-bit mode.