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NEC PD78F9488 User Manual

Page 252

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PTER 13 LCD CONTROLLER/DRIVER

252

User’s Manual U15331EJ4V1UD

LCDC03 LCDC02 LCDC01 LCDC00

2

2

f

LCD

2

6

f

LCD

2

7

f

LCD

2

8

f

LCD

2

9

LCDON0

VAON0

V

LC0

COM0 COM1 COM2 COM3

3 2 1 0

3 2 1 0

6 5

7

4

FA00H

LCDON0

3 2 1 0

3 2 1 0

6 5

7

4

FA1BH

LCDON0

S27

f

X

/2

5

f

X

/2

6

f

X

/2

7

f

XT

S0

f

LCD

3 2 1 0

3 2 1 0

6 5

7

4

FA0FH

LCDON0

S15

LCDCL

LIPS0

GAIN

V

LC2

CAPH CAPL

V

LC1

VAON0

3 2 1 0

3 2 1 0

6 5

7

4

FA10H

LCDON0

S16

LCDM00

LCD clock control
register 0 (LCDC0)

LCD display mode
register 0 (LCDM0)

LCD

clock

selector

Clock

generator for

boosting

Selector

Prescaler

Booster circuit

Segment voltage

controller

Common voltage

controller

Common driver

........

........

........

........

........

........

........

........

........

........

........

........

........

........

.......

.........

. . . . . . . . .

. . . . . . . . .

Segment

driver

Segment

driver

Segment

driver

Segment

driver

Selector

Selector

Selector

Selector

Selected by mask option
or port function register

Display data memory

Internal bus

LCD voltage boost
control register 0 (LCDVA0)

Timing

controller

Figure 13-2. LCD Controller/Driver Block Diagram

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