LC75814VS-TLM-E Datasheet LC75814VS-TLM-E, LC75814V-TLM-E | P7-P9

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

LCD

) when the display data D13 is 1, and will output a low level (V

) when D13 is 0.

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.

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LC75814V

Control data Output pin states

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

DR Drive type

0 1/3 bias drive

1 1/2 bias drive

SC Display state

0 On

1 Off

BU Mode

0 Normal mode

Power saving mode (The OSC pin oscillator is stopped, and the common and segment output pins go to the V

level. However, the

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.)

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Display Data to Segment Output Pin Correspondence

Note: This applies to the case where the S1/P1 to S4/P4 output pins are set to be segment output ports.

For example, the table below lists the segment output states for the S11 output pin.

Segment

COM1 COM2 COM3 COM4

output pin

S1/P1 D1 D2 D3 D4

S2/P2 D5 D6 D7 D8

S3/P3 D9 D10 D11 D12

S4/P4 D13 D14 D15 D16

S5 D17 D18 D19 D20

S6 D21 D22 D23 D24

S7 D25 D26 D27 D28

S8 D29 D30 D31 D32

S9 D33 D34 D35 D36

S10 D37 D38 D39 D40

S11 D41 D42 D43 D44

S12 D45 D46 D47 D48

S13 D49 D50 D51 D52

S14 D53 D54 D55 D56

S15 D57 D58 D59 D60

S16 D61 D62 D63 D64

Display data

Segment output pin (S11) state

D41 D42 D43 D44

0 0 0 0 The LCD segments corresponding to COM1 to COM4 are off.

0 0 0 1 The LCD segment corresponding to COM4 is on.

0 0 1 0 The LCD segment corresponding to COM3 is on.

0 0 1 1 The LCD segments corresponding to COM3 and COM4 are on.

0 1 0 0 The LCD segment corresponding to COM2 is on.

0 1 0 1 The LCD segments corresponding to COM2 and COM4 are on.

0 1 1 0 The LCD segments corresponding to COM2 and COM3 are on.

0 1 1 1 The LCD segments corresponding to COM2, COM3 and COM4 are on.

1 0 0 0 The LCD segment corresponding to COM1 is on.

1 0 0 1 The LCD segments corresponding to COM1 and COM4 are on.

1 0 1 0 The LCD segments corresponding to COM1 and COM3 are on.

1 0 1 1 The LCD segments corresponding to COM1, COM3 and COM4 are on.

1 1 0 0 The LCD segments corresponding to COM1 and COM2 are on.

1 1 0 1 The LCD segments corresponding to COM1, COM2 and COM4 are on.

1 1 1 0 The LCD segments corresponding to COM1 to COM3 are on.

1 1 1 1 The LCD segments corresponding to COM1 to COM4 are on.

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1/4 Duty, 1/2 Bias Drive Technique

1/4 Duty, 1/2 Bias Waveforms

512

OSC

[Hz]

COM1

LCD

COM2

COM3

COM4

LCD driver output when all LCD

segments corresponding to COM1,

COM2, COM3, and COM4 are turned off.

LCD driver output when only LCD

segments corresponding to COM1 are

on.

LCD driver output when only LCD

segments corresponding to COM2 are

on.