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An HD44780 Character LCD is a de facto industry standard liquid crystal display (LCD) display device designed for interfacing with embedded systems. These screens come in common configurations of 8x1, which is one row of eight characters, 16x2, and 20x4, among others. The largest such configuration is 40x4 characters, but these are rare and are actually two separate 20x4 screens seamlessly joined together as there is an inherent 80 character limit.
These screens are often found in copiers, fax machines, laser printers, industrial test equipment, networking equipment such as routers and storage devices, etc. These are not the kind of screens one would find in a cell phone, portable television, etc. They are limited to text only, with eight customizable characters.
Character LCDs can come with or without backlights, which may be LED, fluorescent, or electroluminescent.
Character LCDs use a standard 14-pin interface. If the screen has a backlight, it will have 16 pins. The pinouts are as follows:
Ground
VCC (+5V)
Contrast adjustment
Register Select (R/S)
Read/Write (R/W)
Clock (Enable)
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Optional backlight positive power rail
Optional backlight negative power rail
Character LCDs can operate in 4-bit or 8-bit mode. In 4 bit mode, pins 7 through 10 are unused and the entire byte is sent to the screen using pins 11 through 14 by sending a nibble at a time.
Font
The character generator ROM contains 208 characters in a 5x8 dot matrix, and 32 characters in a 5x10 dot matrix.
There is a Japanese version of the ROM which includes kana characters, and a European version which includes Cyrillic and Western European characters.
The 7-bit ASCII subset for the Japanese version is non-standard: it supplies a Yen symbol where the backslash character is normally found, and left and right arrow symbols in place of tilde and the rub-out character.
See also
LCD Smartie open source display driver for Microsoft Windows
External links
DjLCDSIM - Online LCD simulator
Hitachi HD44780U (LCD-II) datasheet
How to Use Intelligent L.C.D.s part one and part two by Julyan Ilett, Everyday Practical Electronics, 1997
Categories: Liquid crystal displays | Display devices
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