HD44780UA00FS 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD44780UA00FS

Dot Matrix Liquid Crystal Display Controller/Driver

Hitachi -> Renesas Electronics 

HD44780U

Pin Functions

Signal

RS

No. of

Lines I/O

1

I

R/W

1

I

E

1

I

DB4 to DB7

4

I/O

DB0 to DB3

4

I/O

CL1

1

O

CL2

1

O

M

1

O

D

1

O

COM1 to COM16 16

O

SEG1 to SEG40 40

O

V1 to V5

5

—

VCC, GND

2

—

OSC1, OSC2 2

—

Device

Interfaced with

MPU

MPU

MPU

MPU

MPU

Extension driver

Extension driver

Extension driver

Extension driver

LCD

LCD

Power supply

Power supply

Oscillation

resistor clock

Function

Selects registers.

0: Instruction register (for write) Busy flag:

address counter (for read)

1: Data register (for write and read)

Selects read or write.

0: Write

1: Read

Starts data read/write.

Four high order bidirectional tristate data bus

pins. Used for data transfer and receive between

the MPU and the HD44780U. DB7 can be used

as a busy flag.

Four low order bidirectional tristate data bus pins.

Used for data transfer and receive between the

MPU and the HD44780U.

These pins are not used during 4-bit operation.

Clock to latch serial data D sent to the extension

driver

Clock to shift serial data D

Switch signal for converting the liquid crystal

drive waveform to AC

Character pattern data corresponding to each

segment signal

Common signals that are not used are changed

to non-selection waveforms. COM9 to COM16

are non-selection waveforms at 1/8 duty factor

and COM12 to COM16 are non-selection

waveforms at 1/11 duty factor.

Segment signals

Power supply for LCD drive

VCC –V5 = 11 V (max)

VCC: 2.7V to 5.5V, GND: 0V

When crystal oscillation is performed, a resistor

must be connected externally. When the pin input

is an external clock, it must be input to OSC1.

8

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