LC75863W

No.7135-9/25

Control Data Functions

(1) S0, S1

     Sleep control data

These control data bits switch between normal mode and sleep mode and set the states of the KS1 to KS6 key scan

output during key scan standby.

Control data

Mode

OSC oscillator

Segment outputs

Common outputs

Output pin states during key scan standby

S0

S1

KS1

KS2

KS3

KS4

KS5

KS6

0

0

Normal

Operating

Operating

H

H

H

H

H

H

0

1

Sleep

Stopped

L

L

L

L

L

L

H

1

0

Sleep

Stopped

L

L

L

L

L

H

H

1

1

Sleep

Stopped

L

H

H

H

H

H

H

Note: This assumes that the KS1/S24 and KS2/S25 output pins are selected for key scan output.

(2) K0, K1

     Key scan output/segment output selection data

These control data bits switch the functions of the KS1/S24 and KS2/S25 output pins between key scan output and

segment output.

Control data

Output pin state

Maximum number of

input keys

Note: KSn (n=1 or 2): Key scan output

Sn (n=24 or 25): Segment output

K0

K1

KS1/S24

KS2/S25

0

0

KS1

KS2

30

0

1

S24

KS2

25

1

X

S24

S25

20

X : don't care

(3) P0 to P2

     Segment output port/general-purpose output port selection data

These control data bits switch the functions of the S1/P1 to S4/P4 output pins between the segment output port and

the general-purpose output port.

Control data

Output pin state

P0

P1

P2

S1/P1

S2/P2

S3/P3

S4/P4

0

0

0

S1

S2

S3

S4

0

0

1

P1

S2

S3

S4

0

1

0

P1

P2

S3

S4

Note: Sn (n=1 to 4): Segment output port

Pn (n=1 to 4): General-purpose output port

0

1

1

P1

P2

P3

S4

1

0

0

P1

P2

P3

P4

The table below lists the correspondence between the display data and the output pins when these pins are selected

to be general-purpose output ports.

Output pin

Corresponding display data

S1/P1

D1

S2/P2

D4

S3/P3

D7

S4/P4

D10

For example, if the S4/P4 output pin is selected to be a general-purpose output port, the S4/P4 output pin will output

a high level (VLCD) when the display data D10 is 1, and will output a low level (VSS) when D10 is 0.

(4) SC

     Segment on/off control data

This control data bit controls the on/off state of the segments.

SC

Display state

0

on

1

off

However, note that when the segments are turned off by setting SC to 1, the segments are turned off by outputting

segment off waveforms from the segment output pins.

(5) DR

     1/2 bias or 1/3 bias drive selection data

This control data bit switches between LCD 1/2 bias or 1/3 bias drive.

DR

Drive scheme

0

1/3 bias drive

1

1/2 bias drive