SC204A datasheet(6/16 Pages) ETC2

No. de pieza	SC204A

Descripción Electrónicos	A dot-matrix character LCD module

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Fabricante Electrónico	ETC2 [List of Unclassifed Manufacturers]

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SC204A

VER2.1

5. Operating Principles

a) Pin description

Pin NO.

Symbol

Level

Function

1

VSS

0V

Ground

2

VDD

4.5V~5.5V

Supply voltage for logic

3

V0

Variable voltage for LCD

4

RS

H/L

H: Instruction code

L: Data

5

R/W

H/L

H: Read signal L: Write signal

6

E

H→L

enable signal

7

DB0

H/L

8

DB1

H/L

9

DB2

H/L

10

DB3

H/L

11

DB4

H/L

12

DB5

H/L

13

DB6

H/L

14

DB7

H/L

Data bits

In case of

4 bits instruction, data is

transferred by twice using only 4 buses of D4

– D7 ,and D0 – D3 are not used

,

first

operation is higher order

4 bits and

second

is

lower

4

bits of

8 bits ,

but in case

of

8

bits

instruction

, data

is

transferred by

data by

data bus

of

D0 –

D7

15

BLA(+)

4.2V

Supply voltage for LED-Backlight

16

BLK(-)

0V

Supply voltage for LED-Backlight

b) Block Diagram

IR

I/O

B

U

F

E

R

LCD

Driving Circuit

P TO S registor

BUSY

FLAG

DR

CG RAM

CG

RAM

Cursor

and

blink

CKT.

COM

Driving

Circuit

DD RAM

AC

Timing Control Circuit

D

E

C

O

D

E

R

RS

R/W

E

D0-D3

D4-D7

VDD

VO

VSS

a. Data Register (DR): Dris a register used for temporary Storage of the data read/write form/into DD

RAM and CG RAM.

b. Instruction Register (IR): is a register available for storing the instruction codes and address

information of display data (DD) RAM and character generator (CG) RAM.

c. BUSY FLAG (BF): When the Busy Flag is “1”,it shows that LCM is in internal operation and it can

not accept the next instruction.

d. Character Generator (CG) ROM: This ROM Generates character pattern from 8-bit character code

and provides 192 character patterns.

e. Character Generator (CG)RAM: This RAM allows the user to rewrite the character patterns freely

according to the program.

f.

Address Counter (AC): This address counter is used to give the address information of DD RAM

and CG RAM.

Akihabara Inc. www.akiba-tech.com

Page 7 of 7

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