LC75879PT_13 Datasheet, PDF (19/35 Pages) ON Semiconductor – LCD Display Driver

LC75879PT
(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
No.A1687-19/35