HD44780 LCD Controller

Description

The HD44780U dot-matrix liquid crystal display controller and driver LSI displays alphanumerics, Japanese kana characters, and symbols. It can be configured to drive a dot-matrix liquid crystal display under the control of a 4- or 8-bit microprocessor. Since all the functions such as display RAM, character generator, and liquid crystal driver, required for driving a dot-matrix liquid crystal display are internally provided on one chip, a minimal system can be interfaced with this controller/driver.

A single HD44780U can display up to one 8-character line or two 8-character lines.

The HD44780U has pin function compatibility with the HD44780S which allows the user to easily replace an LCD-II with an HD44780U. The HD44780U character generator ROM is extended to generate 208 5 × 8 dot character fonts and 32 5 × 10 dot character fonts for a total of 240 different character fonts.

The low power supply (2.7V to 5.5V) of the HD44780U is suitable for any portable battery-driven product requiring low power dissipation.

Features

• 5 × 8 and 5 × 10 dot matrix possible
• Low power operation support:
  — 2.7 to 5.5V
• Wide range of liquid crystal display driver power
  — 3.0 to 11V
• Liquid crystal drive waveform
  — A (One line frequency AC waveform)
• Correspond to high speed MPU bus interface
  — 2 MHz (when VCC = 5V)
• 4-bit or 8-bit MPU interface enabled
• 80 × 8-bit display RAM (80 characters max.)
• 9,920-bit character generator ROM for a total of 240 character fonts
  — 208 character fonts (5 × 8 dot)
  — 32 character fonts (5 × 10 dot)
• 64 × 8-bit character generator RAM
  — 8 character fonts (5 × 8 dot)
  — 4 character fonts (5 × 10 dot)
• 16-common × 40-segment liquid crystal display driver
• Programmable duty cycles
  — 1/8 for one line of 5 × 8 dots with cursor
  — 1/11 for one line of 5 × 10 dots with cursor
  — 1/16 for two lines of 5 × 8 dots with cursor
• Wide range of instruction functions:
  — Display clear, cursor home, display on/off, cursor on/off, display character blink, cursor shift, display shift
• Pin function compatibility with HD44780S
• Automatic reset circuit that initializes the controller/driver after power on
• Internal oscillator with external resistors
• Low power consumption

HD44780U Pin Arrangement (FP-80B)

HD44780 Datasheet