LC75857E Datasheet, PDF (13/39 Pages) Sanyo Semicon Device – CMOS IC 1/3, 1/4 Duty LCD Display Drivers with Key Input Function

LC75857E, LC75857W
5. P0 to P2 : Segment output port/general-purpose output port selection 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
P0
P1
P2
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
S1/P1
S1
P1
P1
P1
P1
Output pin state
S2/P2 S3/P3
S2
S3
S2
S3
P2
S3
P2
P3
P2
P3
S4/P4
S4
S4
S4
S4
P4
Note: Sn(n=1 to 4): Segment output port
Pn(n=1 to 4): General-purpose output port
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
Corresponding display data
1/3 duty
1/4 duty
S1/P1
D1
D1
S2/P2
D4
D5
S3/P3
D7
D9
S4/P4
D10
D13
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 (V_LCD) when the display data D13 is 1, and will output a low level
(Vss) when D13 is 0.
6. 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.
7. DR : 1/2 bias or 1/3 bias drive selection data
This control data bit switches between LCD 1/2 bias or 1/3 bias drive.
DR
Bias drive scheme
0
1/3 bias drive
1
1/2 bias drive
8. DT : 1/3 duty or 1/4 duty drive selection data
This control data bit switches between LCD 1/3 duty or 1/4 duty drive.
DT
Duty drive scheme
0
1/4 duty drive
1
1/3 duty drive
Note: COM4: Common output
S39 : Segment output
Output pin state (COM4/S39)
COM4
S39
No. 7980-13/39