Hitachi HD44780 Quick Manual

LCD module
Hitachi HD44780 controller Hitachi HD44780 controller
Interface
1 Vss GND
2 VDD Vcc (+5V ± 5%)
3 Vo Contrast Adjustment
4 RS Register Select
5 R/W Read / Write
6 E Enable signal
7-14 DB0-DB7 Data Bus
Quick guide for standard write
Set RS and data
1.
Set E
2.
Wait at least PW
3.
EH
Clear E
4.
Wait t
5.
cycE
(initialization is different!!)
and compatible
Main features
5x8 character dot matrix display
80x8-bit display RAM
64x8-bit character generator RAM
4-bit or 8-bit interface
Timing
min min
Item Item
@ 2.7-4.5V @ 4.5-5.5V
PW 450 ns 230 ns
EH
t 1000 ns 500 ns
cycE
t 60 ns 40 ns
AB
t 20 ns 10 ns
AH
t 195 ns 80 ns
DBW
t 10 ns 10 ns
H
t 5 ns 5 ns
DHR
ET-LCD port on ET-BASE AVR
ET-CLCD pin
1 2 3 4 5
signal GND +Vcc Vo RS R/W
AVR pin (LCD
PG4
GND +Vcc GND
ADJ)
description description
E hold
E cycle
address setup
address hold
data setup (write)
data hold (write)
data hold (read)
6 7 8 9 10 11 12 13
EN D0 D1 D2 D3 D4 D5 D6
PD7 PG0 PG1 PG2 PG3
GND GND GND GND
14
D7
1