LC75886PW Datasheet, PDF (13/36 Pages) ON Semiconductor – 1/4 and 1/3-Duty LCD Display Driver

LC75886PW
5. K0, K1 … Key scan output/segment output switching control data
These control data bits switch the functions of the KS1/S55 and KS2/S56 output pins between the key scan output
and the segment output.
Control data
K0
K1
Output pin state
KS1/S55
KS2/S56
Maximum number
of input keys
0
0
KS1
KS2
30
0
1
S55
KS2
1
X
S55
S56
25
Note: KSn (n=1 or 2): Key scan output
20
Sn (n=55 or 56): Segment output
X : don't care
6. P0 to P2 … Segment output port/general-purpose output port switching control data
These control data bits switch the functions of the S1/P1 to S4/P4 output pins between the segment output port and
the general-purpose output port.
Control data
Output pin state
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
Note: Sn (n=1 to 4): Segment output port
0
1
1
P1
P2
P3
S4
Pn (n=1 to 4): General-purpose output port
1
0
0
P1
P2
P3
P4
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.
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
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, 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.
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
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.
8. FC0 to FC2 … Common and segment output waveform frame frequency control data
These control data bits set the common and segment output waveform frequency.
Control data
FC0 FC1 FC2
Frame frequency
fO[Hz]
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
fOSC/768, fCK/768
fOSC/576, fCK/576
fOSC/384, fCK/384
fOSC/288, fCK/288
fOSC/192, fCK/192
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