64COM/128SEG GRAPHIC DRIVER FOR DOT MATRIX LCD

S6B0708

17

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

V1

V2

0

V4

V3

V5

V0

1

V0

V5

Display Off

-

V2 or V3

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 5.

Table 5. Power supply initial conditions.

Item

Symbol

Min

Typ

Max

Unit

Reset time

tRESETB

1.0

-

-

s

Rise time

tr

-

-

200

ns

tr

VDD

RESETB

tRESETB

0.7VD D

0.3VD D

Figure 5. Reset timing