Epson SED1278F/D Product Manual

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
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
6 Kinds of character font
Single power supply ................... 5V 10% (Logic)
Low LCD driving voltage ............ V
Package ..................................... SED1278F: QFP5-80pin (plastic)
BLOCK DIAGRAM
DB0
DB7
E
R/W
RS
V
DD
V
SS
V1
V2
V3
V4
V5
Dot Matrix LCD Controller Driver
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)
2 lines, 80 characters
(When accompanied with SED1181F
7 dots+Cursor line (5
5 10 dots+Cursor line
> = 3.0V
-V
DD 5
SED1278D: Die form (Al pad)
Cursor/
Instruction Decoder
Brink Control
Address
Instruction Register
Counter ACC
8
7
Data Register
8
Display Data RAM
M P X
Character
Generator
8
RAM
(CG RAM)
64 Bytes 5 10
5
M P X
5
Parallel/Serial
Data Converter
SEIKO EPSON CORPORATION
SED1278F/D
1 line
/D , SED1681F
LA LA
8 dots also possible)
OSC1 OSC2
Oscillation
Refresh Address Counter
Circuit
7
M P X Timing Generator
DD RAM
Shift Register 16 Bits
80 Bytes
Common Driving
Output Circuit
8
Character
Generator
Segment Driving
RAM
Output Circuit
(CG RAM)
240 Byts
5
Latch Circuit
40 Bits
Shift Register
40 Bits
PF282-07
SED1278F/D
ROM 240 characters
)
RAM 8 characters
/D )
OA OA
XSCL
LP
FR
COM1
COM16
SEG1
SEG40
D0
1