PRELIMINARY SPECIFICATION

64COM/128SEG DRIVE FOR DOT MATRIX LCD

KS0708

15

M/M-96-D001

97-09-19

LCD Driver

LCD driver circuit has 192 outputs of 128 segment outputs, 64 common outputs for LCD driving.

Each common output has a shift register. LCD driving output voltage is determined by the combination of

display data and internal AC signal.

Display Data

Common output

Segment output

0

V1

V2

V4

V3

1

V5

V0

V0

V5

Display OFF

-

V2 or V3

Table 4. Relationship between data for each input signal and the LCD drive output.

Reset Circuit

Reset function can initialize system by setting RESETB terminal at Low level. When RESETB becomes

low, following procedure occurs.

- Display start line : 0(First)

- Display ON/OFF : OFF

While RESETB is in Low level, no instruction except Status Read can be accepted. Reset status appears

at DB4. Refers to Read Status of ¢©INSTRUCTION DESCRIPTION ¢©.

The conditions of power supply at initial power up are shown in table 3.

Item

Symbol

Min

Typ

Max

Unit

Reset time

1.0

-

-

us

Rise time

tr

-

-

200

ns

Table 5. Power supply initial Conditions.

tr

VDD

RESETB

0.7VDD

0.3VDD

Figure 6. Reset Timing