Hitachi HD44780 User manual

LCD module

Hitachi HD44780 controller

Hitachi

HD44780

controller

and compatible

Main features

z5x8 character dot matrix display

z80x8-bit display RAM

z64x8-bit character generator RAM

z4-bit or 8-bit interface

Interface

1VssGND

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

Timing

Item

min min

description

Item

@ 2.7-4.5V @ 4.5-5.5V

description

PWEH 450 ns 230 ns E hold

tcycE 1000 ns 500 ns E cycle

tAB 60 ns 40 ns address setup

tAH 20 ns 10 ns address hold

tDBW 195 ns 80 ns data setup (write)

tH10 ns 10 ns data hold (write)

tDHR 5 ns 5 ns data hold (read)

Quick guide for standard write

1. Set RS and data

2. Set E

3. Wait at least PWEH

4. Clear

5. Wait tcycE

(initialization is different!!)

ET-LCD port on ET-BASE AVR

ET-CLCD pin 1 2 3 4 5 6 7891011121314

signal GND +Vcc Vo RS R/W EN D0 D1 D2 D3 D4 D5 D6 D7

AVR pin GND +Vcc (LCD

ADJ) PG4 GND PD7 GND GND GND GND PG0 PG1 PG2 PG3

4-bit interface

zbus lines DB0-DB3 disabled

z4 high order bits followed by 4 low order bits

Display addressing

Display position 1 2 3 4 5 … 39 40

DDRAM address

(row 1) 00 01 02 03 04 … 26 27

DDRAM address

(row 2) 40 41 42 43 44 … 66 67

Instruction Set

1. Designate functions

(display format, data length etc.)

2. Set internal RAM address

Dt t f

rans

4. Miscellaneous functions

instuctions

1 tclock tick @ 16MHz = 62.5 n

1us = 1000us/(62.5ns/instr) = 1

37us = 592 instructions

Instructions - Legend Internal Reset Procedure

1. Display clear

2. Function set:

DL = 1; 8-bit interface data

N = 0; 1-line display

F = 0; 5 x 8 dot character font

3. Display on/off control:

D = 0; Display off

C = 0; Cursor off

B = 0; Blinking off

4. Entry mode set:

I/D = 1; Increment by 1

S = 0; No shift

Instruction

terface

Initializing b

4-bit in

Instruction

terface

Initializing b

8-bit in

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