Epson SED1278D, Product Manual

1

SED1278F/D

Dot Matrix LCD Controller Driver

SEIKO EPSON CORPORATION

PF282-07

 1/8, 1/11 or 1/16 Duty Dot Matrix Drive
 Built-in Character Generator ROM and RAM

  (                        )

 Maximum Simultaneous Display of 80 Characters

   (With extension LCD driver)

 DESCRIPTION

The SED1278F/D is a dot matrix LCD controller/driver which is dedicated to character display. It is capable of
displaying up to 80 characters under 4-bit/8-bit MPU control.
The built-in character generator ROM has an extended capacity of 240 different characters, each being generated
in a 5 10 dots font compatible with a 1/11 duty. In addition, the SED1278F/D contains 64 bytes of character
generator RAM in which the user can store 8 different characters, each consisting of 5 8 dots. These memory
features offer high flexibility in character display.
The guaranteed minimum LCD driving voltage is 3V, and this makes the SED1278F/D suitable for driving low
voltage LCDs.

 FEATURES

 Display RAM ............................... 80 bytes (80 characters)
 Character generator ROM .......... 240 characters (Able to 256 characters)
 Character generator RAM .......... 8 characters
 Built-in CR oscillator, Built-in power-on reset circuit
 Maximim display dimension ....... 40 characters   2 lines, 80 characters   1 line

(When accompanied with SED1181F

LA

/D

LA

, SED1681F

OA

/D

OA

)

 1/8, 1/11 or 1/16 duty matirx drive (fixed by command)
 2 flame AC wave-form drive
 High-speed bus interface with 4-bit/8-bit MPU
 Powerful display control instructions
 Character .................................... 5   7 dots+Cursor line (5   8 dots also possible)

5   10 dots+Cursor line

 6 Kinds of character font
 Single power supply ................... 5V

±

10% (Logic)

 Low LCD driving voltage ............ V

DD

-V

5

>

= 3.0V

 Package ..................................... SED1278F: QFP5-80pin (plastic)

SED1278D: Die form (Al pad)

 BLOCK DIAGRAM

ROM 240 characters
RAM     8 characters

Instruction Decoder

M P X

M P X

M P X

Display Data RAM

DD RAM
80 Bytes

Character
Generator

RAM

(CG   RAM)

64 Bytes

Character
Generator

RAM

(CG   RAM)

5   10       240 Byts

Instruction Register

Refresh Address Counter

Address

Counter ACC

Parallel/Serial

Data Converter

Shift Register

40 Bits

Latch Circuit

40 Bits

Segment Driving

Output Circuit

Common Driving

Output Circuit

Shift Register 16 Bits

Timing Generator

Oscillation

Circuit

DB0

DB7

8

8

8

5

5

8

5

7

7

Cursor/

Brink Control

Data Register

I/O Buffer

I/O Control

~

E

R/W

RS

V

DD

V

SS

V1

V2
V3

V4

V5

OSC1 OSC2

XSCL

LP

FR

COM1

COM16

~~

SEG1

SEG40

D0

SED1278F/D