Warning: This site is under construction, most links will be broken.

Electronics -> The Z80 project -> HD44780 LCD

Last modified on Thu, 3rd Apr 2008 at 02:13 BST by zipplet

-------------------------------------------------------------------------------
| LCD pin | 8255A pin | Description                                           |
-------------------------------------------------------------------------------
| 1: VSS  | -         | Ground                                                |
| 2: VCC  | -         | 5V supply                                             |
| 3: VO   | -         | LCD drive voltage (contrast adjustment)               |
| 4: RS   | PC0       | Data/command select                                   |
| 5: R/W  | PC1       | Read/write direction select                           |
| 6: E    | PC2       | Clock (data enable)                                   |
| 7 - 14  | PB0 - 7   | Bi-directional data bus                               |
| 15: A   | -         | Backlight anode (5V supply, 24R resistor              |
| 16: K   | -         | Backlight ground                                      |
-------------------------------------------------------------------------------

The white on blue LCD display I used seems to need a 24 ohm resistor on the
backlight drive otherwise the backlight draws a much higher current than
indicated in the datasheet!


<<< Back to The Z80 project