HD44780 display
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.
| 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 |
