Serial Data Transfer Example

1. When 201 or more segments are used

All 320 bits of serial data must be sent.

2. When fewer than 201 segments are used

Either 80, 160 or 240 bits of serial data may be sent, depending on the number of segments used. However, the serial

data shown below (the D1 to D68 display data and the control data) must be sent.

Control Data Functions

1. P0 to P3: Segment output port/general-purpose output port switching control data

These control data bits switch the segment output port/general-purpose output port functions of the S1/P1 to S8/P8

output pins.

Note: Sn (n = 1 to 8): Segment output port function

Pn (n = 1 to 8): General-purpose output port function

Note that when the general-purpose output port function is selected, the correspondence between the output pins and

the display data will be that shown in the table.

For example, if the general-purpose output port function is selected for the S4/P4 output pin, that output pin will

LC75874E, 75874W

Control data

Output pin state

P0

P1

P2

P3

S1/P1

S2/P2

S3/P3

S4/P4

S5/P5

S6/P6

S7/P7

S8/P8

0

0

0

0

S1

S2

S3

S4

S5

S6

S7

S8

0

0

0

1

P1

S2

S3

S4

S5

S6

S7

S8

0

0

1

0

P1

P2

S3

S4

S5

S6

S7

S8

0

0

1

1

P1

P2

P3

S4

S5

S6

S7

S8

0

1

0

0

P1

P2

P3

P4

S5

S6

S7

S8

0

1

0

1

P1

P2

P3

P4

P5

S6

S7

S8

0

1

1

0

P1

P2

P3

P4

P5

P6

S7

S8

0

1

1

1

P1

P2

P3

P4

P5

P6

P7

S8

1

0

0

0

P1

P2

P3

P4

P5

P6

P7

P8

Output pin

Corresponding display data

S1/P1

D1

S2/P2

D5

S3/P3

D9

S4/P4

D13

Output pin

Corresponding display data

S5/P5

D17

S6/P6

D21

S7/P7

D25

S8/P8

D29

8 bits

80 bits

80 bits

8 bits