PT6552

V1.3

6

July 2010

CONTROL SERIAL DATA FUNCTION

1. S0, S1: SLEEP CONTROL DATA

This control data switches the LSI between normal mode and sleep mode. It also sets the key scan output standby states

for pinsKS1 to KS6.

Control Data

Mode

Oscillator

Segment outputs

Common outputs

Key scan standby mode output pin states

S0

S1

KS1

KS2

KS3

KS4

KS5

KS6

0

0

Normal

Oscillator

Operation

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

2.K0, K1: KEY SCAN OUTPUT/SEGMENT OUTPUT SELECTION DATA

This control data switches the KS1/SG44 and KS2/SG45 output pins between the key scan output and segment output

function.

Control data

Output pin states

Maximum number of key inputs

K0

K1

KS1/SG44

KS2/SG45

0

0

KS1

KS2

30

0

1

SG44

KS2

25

1

X

SG44

SG45

20

X: don’t care

3. P0, P1: SEGMENT OUTPUT PORT/GENERAL-PURPOSE OUTPUT PORT

SELECTION DATA

This control data switches the SG1/P1 to SG4/P4 output pins between the segment output port and the general-purpose

output port function.

Control data

Output pin states

P0

P1

SG1/P1

SG2/P2

SG3/P3

SG4/P4

0

0

SG1

SG2

SG3

SG4

0

1

P1

P2

SG3

SG4

1

0

P1

P2

P3

SG4

1

1

P1

P2

P3

P4

The table below lists the correspondence between the display data and the output pins when the general-purpose output

port function is selected.

Output pin

Corresponding display data

SG1/P1

D1

SG2/P2

D3

SG3/P3

D5

SG4/P4

D7

For example, if the output pin SG4/P4 is set for use as a general-purpose output port, the output pin SG4/P4 will output

a high level when the display data D7 is 1.

4. SC: SEGMENT ON/OFF CONTROL DATA

This control data controls the segment on/off states.

SC

Display states

0

On

1

Off