LC75829PE, LC75829PW
www.onsemi.com
15
(5) DN … S52 pin and S53/OSCI pin state setting control data
This control data bit sets state of the S52 pin and the S53/OSCI pin.
DN
Number of display segments Pin state
1/4 duty 1/3 duty S52 S53/OSCI
0 Up to 200 segments Up to 153 segments “L” (V
SS
) “L” (V
SS
)/OSCI
1 Up to 208 segments Up to 159 segments S52 S53/OSCI
Note: “L” (V
SS
) : Low (V
SS
) level output
S52 : Segment output
“L” (V
SS
)/OSCI : Low (V
SS
) level output in internal oscillator operating mode (OC=0)
: External clock input in external clock operating mode (OC=1)
S53/OSCI : Segment output in internal oscillator operating mode (OC=0)
External clock input in external clock operating mode (OC=1)
(6) 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 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, f
CK
1=300[kHz]typ)
External clock operating mode
(The control data OC is 1
and EXF is 1, f
CK
2=38[kHz]typ)
0 0 0 fosc/6144 f
CK
1/6144 f
CK
2/768
0 0 1 fosc/4608 f
CK
1/4608 f
CK
2/576
0 1 0 fosc/3072 f
CK
1/3072 f
CK
2/384
0 1 1 fosc/2304 f
CK
1/2304 f
CK
2/288
1 0 0 fosc/1536 f
CK
1/1536 f
CK
2/192
1 0 1 fosc/1152 f
CK
1/1152 f
CK
2/144
1 1 0 fosc/768 f
CK
1/768 f
CK
2/96
Note: When is setting (FC0,FC1,FC2)=(1,1,1), the frame frequency is same as frame frequency at the time of the
(FC0,FC1,FC2)=(0,1,0) setting (fosc/3072, f
CK
1/3072, f
CK
2/384).
(7) 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 (S53/OSCI) state
0 Internal oscillator operating mode S53
1 External clock operating mode OSCI
Note: S53: Segment output
OSCI: External clock input
(8) 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.
(9) 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
In this mode, the internal oscillator circuit stops oscillation (the S53/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 S53/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
SS
level. However, the S1/P1
to S4/P4 output pins can be used as general-purpose output ports under the control of the data bits P0 to
P2. (The general-purpose output port P1 can not be used as clock output).
