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

outputs during key scan standby.

Note: This assumes that the KS1/S23 and KS2/S24 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/S23 and KS2/S24 output pins between key scan output and

segment output.

!: 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.

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.

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 D13 is 1, and will output a low level(VSS) when D13 is 0.

4. SC: Segment on/off control data

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

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.

No. 6860-9/26

LC75864E, 75864W

Control data

Mode

OSC oscillator

Segment outputs

Output pin states during key scan standby

S0

S1

Common outputs

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

Control data

Output pin state

Maximum number of input keys

K0

K1

KS1/S23

KS2/S24

0

0

KS1

KS2

30

0

1

S23

KS2

25

1

!

S23

S24

20

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

0

1

1

P1

P2

P3

S4

1

0

0

P1

P2

P3

P4

Output pin

Corresponding display data

S1/P1

D1

S2/P2

D5

S3/P3

D9

S4/P4

D13

SC

Display state

0

On

1

Off

Notes: KSn (n = 1 , 2): Key scan output

Sn (n = 23, 24): Segment output

Notes: Sn (n = 1 to 4):

Segment output port

Pn (n = 1 to 4):

General-purpose output port