HD44780 display

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Hitachi HD44780 compatibele LCD

Pinout

A HD44780 compatible display has 14 or 16 pins, depending whether it has backlight. For a working display, you need a minimum of 6 microcontroller ports: RS, EN and D4-D7.

HD44780 pinout
Pin Name Description
1 VSS Ground
2 VDD +5 volts
3 VLC Contrast voltage, normally < 1V
4 RS Register Select (high=Data write, low=Command write)
5 R/W Read/Write (high=read, low=write)
6 EN Enable: high pulse latches command or data
7-10 DB0-DB3 8-bit mode only: data/command bits 0-3
11-14 DB4-DB7 8-bit mode: data/command bits 4-7, or both nibbles in 4-bit mode
15,16 AB,KB (optional) Background light: anode, kathode


Operation

8-bit

4-bit

physical device

references

joshuagalloway.com's lcd page