Control Data Functions

1. P0 to P2: Segment output port/general-purpose output port switching control data.

These control data bits switch the S1/P1 to S4/P4 output pins between their segment output port and general-purpose

output port functions.

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

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

Also note that when the general-purpose output port function is selected, the output pins and the display data will

have the correspondences listed in the tables below.

For example, if the output pin S4/P4 has the general-purpose output port function selected, it will output a high level

2. DR: 1/2 bias drive or 1/3 bias drive switching control data

This control data bit selects either 1/2 bias drive or 1/3 bias drive.

3. SC: Segments 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.

4. BU: Normal mode/power-saving mode control data

This control data bit selects either normal mode or power-saving mode.

No. 6235-7/14

LC75844M

Control data

Output pin states

P0

P1

P2

S1/P1

S2/P2

S3/P3

S4/P4

00

0

S1

S2S3

S4

00

1

P1

S2S3

S4

01

0

P1

P2S3

S4

01

1

P1

P2P3

S4

10

0

P1

P2P3

P4

Output pin

Corresponding display data

S1/P1

D1

S2/P2

D5

S3/P3

D9

S4/P4

D13

DR

Drive type

0

1/3 bias drive

1

1/2 bias drive

SC

Display state

0On

1

Off

BU

Mode

0

Normal mode

1

S1/P1 to S4/P4 output pins that are set to be general-purpose output ports by the control data P0 to P2 can be used as general-

purpose output ports.)