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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Hitachi Liquid crystal displays Display devices. Note how the main loop has no code since we only want to initialise and display the text without doing anything else.

Using these it hitacchi possible to create a simple bar graph to display a graphical representation of voltage etc. Once in 4-bit mode, character and control data are transferred as pairs of 4-bit “nibbles” on the upper data pins, D7-D4.

Hitachi HD LCD –

Hi is lcd initialization same for all lcds available on the market? Remember Me Lost your password? It shows how that hitchi make code generalised and easy to use there is a sacrifice in performance.

Secondly to manipulate each data bit to direct it to the output takes a few operations involving selecting the pin and then shifting the value right. The tables below show the instruction set and character table.

Really nice about LCD interfacing! Very nice job with the overall presentation.


This cuts the interface to the absolute bare essentials. This is a simple example. Instructions and Characters The tables below show the instruction set and character table. Thank you for these pages. Tell the software what hitacih you have – must be called before other commands. Normally you would drive an LCD display from a microcontroller, computer or similar device.

Non-LED backlights often require higher voltages. There’s nothing wrong with the code but it has to do a lot of manipulation to make the operation generic. All articles with unsourced statements Articles with unsourced statements from June Commons category link is on Wikidata Commons category link is on Wikidata using P Previous article More hitxchi products for February.

The way it is done here is “safe” but gives a big performance hit at each lcd write operation. Returns cursor hhd44780 home position. First, with D3-D0 unconnected, these lines will always appear low 0b to the HD when it is in 8-bit mode.

It’s clever and works in all cases but again there is a performance hit. HD based display modules also have a 4 bit interface mode. The Hitachi HD has many commands, Here are the most useful: Do you have more?

HD44780 Character LCD Displays – Part 1

Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4. Pinout The module that we are using is a 16 character x 2 line display that we stock over here.

Inside the HD you still have 8 bit operation so for 4 bit mode you do two writes to get that 8 bit quantity inside the chip. Under this mode the data or command is transferred to the module using 2, 4 bit nibbles.


Very polished and articulate presentation. This is an overloaded function that can print any of the three number types or a string. Character LCDs use a 16 contact interface, commonly using pins or card edge connections on hd4780. This pattern is the default pattern for an uninitialized LCD display. Your shopping bag is empty. This pin is use to control whether you are reading or writing to the display.

Secrets of the Hitachi HD LCD: How to display text and bargraphs.

Next article Debouncing a switch. There are two interesting parts to this operation. For arduino operation, performance is not as important as speed and ease of coding and it allows users to mix and match code to get it working but you should be aware that underneath all the magic there can be a lot going on and you could re-write it or re-wire the hardware for better performance. My thanks and gratitude for such an excellent explanation of how 16 char LCDs work which even I can understand.