PT6530 Datasheet, PDF (19/42 Pages) Princeton Technology Corp – LCD Driver IC

PT6530
6.2.4 P0 TO P3: SEGMENT OUTPUT/GENERAL-PURPOSE OUTPUT PORT
SELECTION DATA
These control data bits switch the functions of the S1/P1 to S8/P8 output pins between the segment output port and the
general-purpose output port.
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
Notes:
1. Sn (n=1 to 8): Segment output port
2. Pn (n=1 to 8): 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/P3
D10
D13
S5/P5
D13
D17
S6/P6
D16
D21
S7/P7
D19
D25
S8/P8
D22
D29
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 (VLCD) when the display data D13 is 1, and will output a low level (Vss)
when D13 is 0.
6.2.5 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.
6.2.6 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
V1.3
19
June 2010