HCD44780 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HCD44780

Dot Matrix Liquid Crystal Display Controller/Driver

Hitachi -> Renesas Electronics 

HD44780U Block Diagram

HD44780U

OSC1 OSC2

CL1

CL2

Reset

M

circuit

ACL

CPG

Timing

generator

Instruction

7

register (IR)

8

MPU

RS

inter-

R/W

face

E

Instruction

decoder

Display

data RAM

(DDRAM)

80 × 8 bits

D

16-bit

shift

register

Common

signal

driver

COM1 to

COM16

Address

7

DB4 to

counter

8

7

DB7

7

Input/ 8 Data

8

DB0 to output

register

DB3

buffer

(DR)

8

8

Busy

flag

40-bit

shift

register

40-bit

latch

circuit

Segment

signal

driver

SEG1 to

SEG40

40

LCD drive

voltage

selector

GND

VCC

Character

generator

RAM

(CGRAM)

64 bytes

Character

generator

ROM

(CGROM)

9,920 bits

Cursor

and

blink

controller

5

5

Parallel/serial converter

and

attribute circuit

V1 V2 V3 V4 V5

3

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