1

Dot Matrix LCD Controller Driver

PF282-07

q 1/8, 1/11 or 1/16 Duty Dot Matrix Drive

q Built-in Character Generator ROM and RAM (

)

q Maximum Simultaneous Display of 80 Characters

(With extension LCD driver)

SED1278F/D

s 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 558 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.

s FEATURES

q Display RAM .............................. 80 bytes (80 characters)

q Character generator ROM .......... 240 characters (Able to 256 characters)

q Character generator RAM .......... 8 characters

q Built-in CR oscillator, Built-in power-on reset circuit

q Maximim display dimension ....... 40 characters52 lines, 80 characters51 line

q 1/8, 1/11 or 1/16 duty matirx drive (fixed by command)

q 2 flame AC wave-form drive

q High-speed bus interface with 4-bit/8-bit MPU

q Powerful display control instructions

q Character ................................... 5!7 dots+Cursor line (5!8 dots also possible)

5!10 dots+Cursor line

q 6 Kinds of character font

q Single power supply ................... 5V

±10% (Logic)

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

SED1278D: Die form (Al pad)

s BLOCK DIAGRAM

ROM 240 characters

RAM

8 characters

Instruction Decoder

MPX

MPX

MPX

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

55

8

5

7

7

Cursor/

Brink Control

Data Register

E

R/W

RS

V

DD

V

SS

V1

V2

V3

V4

V5

OSC1 OSC2

XSCL

LP

FR

COM1

COM16

SEG1

SEG40

D0