introduction to Hitachi HD LCD module, pinout pin detials,instructions set, commands for HD lcd interfacing with microcontroller. Download the Hitachi HD LCD Controller Datasheet and browse our LCDs that use this controller. Version HDU (LCD-II) (Dot Matrix Liquid. Download the Hitachi HD Compatible LCD Controller Datasheet and browse Our LCDs that use this controller. Version HDU (LCD-II) (Dot.
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The Hitachi HD controller hitacni become an industry standard for these types of displays. This tutorial will teach you the basics of interfacing with a HD compatible display using some DIP switches and a few other components.
The module that we are using is a 16 character x 2 line display that we stock over here. The figure below shows the LCD module and pinout.
You will notice that pin 5 RW is tied to ground. This pin is use to control whether you are reading or writing to the display. Since reading from the display is very rare, most people just tie this pin to ground.
Controlling LCD displays with the Hitachi HD driver
Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4. The RS lines tells the module whether the 8 data bits relate to data or a command.
This means that when enable transitions from high to low, the values of D0 to D7 and RS are read. HD based display modules also have a 4 bit interface mode. Under this mode the data or command is transferred to the module using 2, 4 bit nibbles. This will be discussed in more detail below. The tables below show the instruction set and character table.
Click on a table to get a larger view.
Normally you would drive an LCD display from hittachi microcontroller, computer or similar device. For this exercise we will use just a series of switches. This cuts the interface to the absolute bare essentials.
The photo below shows the circuit, on a breadboard without the LCD module.
Controlling LCD displays with the Hitachi HD44780 driver
You can get the parts for the power supply here. The Register Select and data lines are pulled down using a 10K resistor and when the dip switch is closed, those lines go high. The enable line on the other hand is pulled high and when the button is pressed, the line goes to ground. The enable button has a 10nF capacitor to de-bounce hd444780.
Before inserting the LCD module into the breadboard, you will need to solder a row of 16 pin single row headers. This is shown in the photo below.
Hitachi HD LCD –
Next we insert the LCD module into the breadboard and power it on. When you insert the module into the breadboard, you need to be gentle and work the pins in slowly because the pins are hitachii bit thicker than you would normally use with a breadboard.
This pattern is the default pattern for an uninitialized LCD display. The main benefit of the 4 bit mode is that less data lines are required. In the next part we will discuss how to hookup the module to a microcontroller and get hd44870 to do the hard work for you. Hi is lcd initialization same for all lcds available on the market? The data sheet does not say much about the contrast voltage; there are a few mostly older, I think hitaci that need a negative contrast voltage.
Really nice about LCD interfacing!
Download the Hitachi HD44780 LCD Controller Datasheet
Thank you for these pages. Very polished and articulate presentation. Do you have more? A web surf for info on the LCD brought me here. This is an excellent hitaachi to operate the device with switches first. My thanks and gratitude for such an excellent explanation of hd44870 16 char LCDs work which even I can understand. I love the quality of your photos too.
Selling your cracked, damaged and broken LCD screens is essential to staying competitive in the cell phone repair business. Much easier to understand than most other sites. Very nice job with the overall presentation. This is a lot easier to understand than reading the datasheet, thanks for taking time to write this article. Your email address will not be published.
Pinout The module that we are using is a 16 character x 2 line display that we stock over here. The potentiometer connected to pin 3 controls the LCD contrast. Sending Data and Commands Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4. Instructions and Characters The tables below show the instruction set and character table.
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Entry Mode, Increment cursor position, No display shift.