Specifications

EPSON 9–31

SED1278

COMPARISON WITH HD44780 BY HITACHI

Item HD44780 (Hitachi) SED1278

Data display RAM 80 bytes ←

Character generator ROM 192 types 240 types

Character font 5 × 7: 160 types

5 × 10: 32 types 5 × 10: 240 types

Character generator RAM 64 bytes ←

LCD drive output 16 common driver outputs ←

40 segment drive outputs

Character font (with cursor) 5 × 8 dots (1/8 and 1/16 duty) ←

5 × 11 dots (1/1 duty)

Conversion to duty 1/8, 1/11, 1/16 ←

LCD drive voltage (VDD–V5) Max. 13.5 V Max. 1 VDD

Min. 4.6 V Min. 3 V

LCD drive waveform Waveform A Waveform D

(Single frame AC drive) (Dual frame AC drive)

E pulse width 450 nsec 220 nsec

Timing to change the address The contents of address counter are The contents of address

counter subsequent to CGRAM determined 1.5 clock after release of counter are determined

and DDRAM data writing and busy state immediately after release

reading (6 microseconds at fOSC = 250 kHz). of busy state.

No. of instructions 11 ←

Reset terminal Not provided ←

Chip selector terminal Not provided ←

Power-on reset terminal Provided ←

Extension segment driver Hitachi HD44100: 40 outputs ←

SED1181FLA: 64 outputs

Package 80-pin plastic flat package ←

Pin layout Pin compatible