LC450029PKB

No.A1916-12/25

Control Data Functions

(1) EXF … Ratio of dividing frequency in external clock operating mode setting control data

This control data sets the ratio of dividing frequency of the external clock which input into the OSCI pad, when the

external clock operating mode (OC=“1”) is set. However, this data is effective only when external clock operating

mode (OC= “1”) is set. The frame frequency is adjustable by setting EXF, FC0 to FC2 and OC.

EXF

Ratio of dividing frequency in external clock operating mode

0

fCK / 8

1

fCK

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

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

DT

Drive scheme

S51 pad’s state

0

1/4-duty drive

Low (VSS) level output

1

1/3-duty drive

S51 (segment output)

(3) DN …The number of the maximum display segments setting control data

This control data bit sets the number of the maximum display segments.

The number of the maximum display segments

Pad’s state

DN

1/4 duty

1/3 duty

S52

S53

0

Up to 200 segments

Up to 153 segments

“L” (VSS)

“L” (VSS)

1

Up to 208 segments

Up to 159 segments

S52 (segment output)

S53 (segment output)

(Note) S53 pad outputs VSS level in external clock operating mode.

(4) FC0 to FC2 …Common/segment output waveform frame frequency control data

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

is adjustable by setting EXF, FC0 to FC2 and OC.

Control data

Frame frequency fo[Hz]

FC0

FC1

FC2

Internal oscillator operating mode

(The control data OC=“0”,

fosc=300[kHz]typ)

External clock operating mode

(The control data

OC=“1”, EXF=“0”)

Case is fCK=300[kHz].

External clock operating mode

(The control data

OC=“1”, EXF=“1”)

Case is fCK=38[kHz].

0

0

0

fosc/6144 =48.8[Hz]typ

fCK/6144 =48.8[Hz]

fCK/768 =49.5[Hz]

0

0

1

fosc/4608 =65.1[Hz]typ

fCK/4608 =65.1[Hz]

fCK/576 =66.0[Hz]

0

1

0

fosc/3072 =97.7[Hz]typ

fCK/3072 =97.7[Hz]

fCK/384 =99.0[Hz]

0

1

1

fosc/2304 =130.2[Hz]typ

fCK/2304 =130.2[Hz]

fCK/288 =131.9[Hz]

1

0

0

fosc/1536 =195.3[Hz]typ

fCK/1536 =195.3[Hz]

fCK/192 =197.9[Hz]

1

0

1

fosc/1152 =260.4[Hz]typ

fCK/1152 =260.4[Hz]

fCK/144 =263.9[Hz]

1

1

0

fosc/768 =390.6[Hz]typ

fCK/768 =390.6[Hz]

fCK/96 =395.8[Hz]

1

1

1

fosc/3072 =97.7[Hz]typ

fCK/3072 =97.7[Hz]

fCK/384 =99.0[Hz]

(5) 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

S53 pad’s state

0

Internal oscillator operating mode

S53 (segment output)

1

External clock operating mode

Low (VSS) level output

(6) SC … Segment on/off (off waveform output) control data

This control data bit controls the on/off (off waveform output) state of all the segments.

SC

Display state

0

On

1

Off of all the segments (off waveform output)

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

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

BU

Mode

0

Normal mode

1

Power-saving mode

All of the common and segment output pads output the VSS level.

In this mode, the internal oscillator circuit stops oscillation if the IC is in the internal oscillator operating mode

(OC=0), and the IC stops receiving external clock signals if the IC is in the external clock operating mode (OC=1).