Rev. 6.00, 08/04, page 407 of 628
13.2
Register Descriptions
13.2.1
LCD Port Control Register (LPCR)
Bit
Initial value
Read/Write
7
DTS1
0
R/W
6
DTS0
0
R/W
5
CMX
0
R/W
4
W
3
SGS3
0
R/W
0
SGS0
0
R/W
2
SGS2
0
R/W
1
SGS1
0
R/W
LPCR is an 8-bit read/write register which selects the duty cycle and LCD driver pin functions.
Bits 7 to 5—Duty Cycle Select 1 and 0 (DTS1, DTS0), Common Function Select (CMX)
The combination of DTS1 and DTS0 selects static, 1/2, 1/3, or 1/4 duty. CMX specifies whether
or not the same waveform is to be output from multiple pins to increase the common drive power
when not all common pins are used because of the duty setting.
Bit 7
DTS1
Bit 6
DTS0
Bit 5
CMX
Duty Cycle
Common Drivers
Notes
0
0
0
Static
COM
1
(initial value) Do not use COM
4
, COM
3
, and
COM
2
.
1
COM
4
to COM
1
COM
4
, COM
3
, and COM
2
output
the same waveform as COM
1
.
0
1
0
1/2 duty
COM
2
and COM
1
Do not use COM
4
and COM
3
.
1
COM
4
to COM
1
COM
4
outputs the same waveform
as COM
3
, and COM
2
outputs the
same waveform as COM
1
.
1
0
0
1/3 duty
COM
3
to COM
1
Do not use COM
4
.
1
COM
4
to COM
1
Do not use COM
4
.
1
1
0
1/4 duty
COM
4
to COM
1
—
1
Bit 4—Reserved
Bit 4 is reserved. It can only be written with 0.
Bits 3 to 0—Segment Driver Select 3 to 0 (SGS3 to SGS0)
Bits 3 to 0 select the segment drivers to be used.
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