LC75879PTS-H Datasheet LC75879PTS-T-H, LC75879PT-H, LC75879PTS-H | P19-P21

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(4) OC … Internal oscillator operating mode/external clock operating mode switching control data

This control data bit selects either the internal oscillator operating mode or external clock operating mode.

OC Fundamental clock operating mode I/O pin (S69/OSCI) state

0 Internal oscillator operating mode S69

1 External clock operating mode OSCI

Note: S69 : Segment output

OSCI : External clock input

(5) 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.

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

Note1: Sn(n=1 to 8): Segment output ports

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

Note2: When are setting (P0,P1,P2,P3)=(1,0,0,1), (1,0,1,0), (1,0,1,1) and (1,1,X,X), the all P1/S1 to P8/S8 output

pins selects the segment output port. X: don’t care

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 (general-purpose output function).

Output pin

Correspondence display data

1/4 duty 1/3 duty

S1/P1 D1 D1

S2/P2 D5 D4

S3/P3 D9 D7

S4/P4 D13 D10

S5/P5 D17 D13

S6/P6 D21 D16

S7/P7 D25 D19

S8/P8 D29 D22

For example, if the circuit is operated in 1/4 duty and the S4/P4 output pin is selected to be a general-purpose output

port and is set general-purpose output function, the S4/P4 output pin will output a high level when the display data

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

(6) DT … 1/4-duty 1/3-bias drive or 1/3-duty 1/3-bias drive switching control data

This control data bit selects either 1/4-duty 1/3-bias drive or 1/3-duty 1/3-bias drive.

DT Drive scheme The COM4/S67 pin state

0 1/4-duty 1/3-bias drive COM4

1 1/3-duty 1/3-bias drive S67

Note: COM4 : Common output

S67 : Segment output

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(7) SC … Segment on/off control data

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

SC Display state

0 On

1 Off

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.

(8) BU … Normal mode/power-saving mode control data

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

BU Mode

Normal mode

Power saving mode

In this mode, the internal oscillator circuit stops oscillation (the S69/OSCI pin is configured for segment output) if the IC is

in the internal oscillator operating mode (OC=0) and the IC stops receiving external clock signals (the S69/OSCI pin is

configured for external clock input) if the IC is in the external clock operating mode (OC=1).

The common and segment output pins go to the V

level. However, the S1/P1 to S8/P8 output pins can be used as

general-purpose output ports under the control of the data bits P0 to P3.

(The general-purpose output port P1 to P4 can not be used as clock output or PWM output).

(9) PF0 to PF3 … PWM output waveform frame frequency setting control data

These control data bits set the frame frequency of the PWM output waveforms. However, when the PWM output

function isn’t used, these control data bits become invalid. In addition, when the external clock operating frequency

is set the f

2 = 38[kHz] typ (EXF = "1") in external clock operating mode (OC = "1") or when the serial data

transfer is the simple mode transfer, these control data bits become invalid.

Control data PWM output waveform frame frequency fp[Hz]

PF0 PF1 PF2 PF3

Internal oscillator operating mode

(The control data OC is 0,

fosc=300[kHz] typ)

External clock operating mode

(The control data OC is 1 and EXF is 0,

1=300[kHz] typ)

0 0 0 0 fosc/1536 f

1/1536

1 0 0 0 fosc/1408 f

1/1408

0 1 0 0 fosc/1280 f

1/1280

1 1 0 0 fosc/1152 f

1/1152

0 0 1 0 fosc/1024 f

1/1024

1 0 1 0 fosc/896 f

1/896

0 1 1 0 fosc/768 f

1/768

1 1 1 0 fosc/640 f

1/640

0 0 0 1 fosc/512 f

1/512

1 0 0 1 fosc/384 f

1/384

0 1 0 1 fosc/256 f

1/256

Note : When is setting (PF0,PF1,PF2,PF3) = (1,1,0,1) and (X,X,1,1), the frame frequency is same as frame

frequency at the time of the (PF0,PF1,PF2,PF3) = (1,0,1,0) setting (fosc/896, f

1/896).

X: don’t care

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(10) FC0 to FC2 … Common/segment output waveform fram frequency control data

These control data bits set the frame frequency of the common and segment output waveforms.

Control data Common/segment output waveform frame frequency fo[Hz]

FC0 FC1 FC2

Internal oscillator

operating mode

(The control data OC is 0,

fosc=300[kHz] typ)

External clock

operating mode

(The control data OC is 1

and EXF is 0,

1=300[kHz] typ)

External clock

operating mode

(The control data OC is 1

and EXF is 1,

2=38[kHz] typ)

1 1 0 fosc/6144 f

1/6144 f

2/768

1 1 1 fosc/4608 f

1/4608 f

2/576

0 0 0 fosc/3072 f

1/3072 f

2/384

0 0 1 fosc/2304 f

1/2304 f

2/288

0 1 0 fosc/1536 f

1/1536 f

2/192

0 1 1 fosc/1152 f

1/1152 f

2/144

1 0 0 fosc/768 f

1/768 f

2/96

Note: When is setting (FC0,FC1,FC2) = (1,0,1), the frame frequency is same as frame frequency at the time of the

(FC0,FC1,FC2) = (0,0,0) setting (fosc/3072, fCK1/3072, fCK2/384).

(11) CT0 to CT2 … Display contrast setting control data

These control data bits set display contrast.

CT0 to CT2: Sets the display contrast (7 steps)

CT0 CT1 CT2 LCD drive 3/3 bias voltage V

0 level

0 0 0 1.00V

-(0.05V

×0)

1 0 0 0.95V

-(0.05V

×1)

0 1 0 0.90V

-(0.05V

×2)

1 1 0 0.85V

-(0.05V

×3)

0 0 1 0.80V

-(0.05V

×4)

1 0 1 0.75V

-(0.05V

×5)

0 1 1 0.70V

-(0.05V

×6)

Note: When is setting (CT0,CT1,CT2) = (1,1,1), the LCD drive 3/3 bias voltage V

0 level is 1.00V

Note that although the display contrast can be adjusted by operating the built-in display contrast

adjustment circuit, it can also be adjusted by modifying the supply pin V

voltage level.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P35

LC75879PTS-H

Mfr. #:

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Manufacturer:

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Description:

LCD Drivers LCD DISPLAY DRIVER

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LC75879PTS-H

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