Register Descriptions; Lcd Port Control Register (Lpcr) - Renesas H8/38024 Hardware Manual

13.2

Register Descriptions

13.2.1

LCD Port Control Register (LPCR)

Bit
DTS1
Initial value
Read/Write 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 Bit 6 Bit 5
DTS1 DTS0 CMX
0 0 0
1
0 1 0
1
1 0 0
1
1 1 0
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.
7 6 5
DTS0 CMX
0 0 0
R/W R/W
Duty Cycle Common Drivers
Static COM
COM
1/2 duty COM
COM
1/3 duty COM
COM
1/4 duty COM
4 3

SGS3 SGS2

0
W R/W
Notes
(initial value) Do not use COM
1
COM
to COM COM
4 1
the same waveform as COM
and COM Do not use COM
2 1
to COM COM
4 1
as COM
same waveform as COM
to COM Do not use COM
3 1
to COM Do not use COM
4 1
to COM —
4 1
Rev. 6.00, 08/04, page 407 of 628
2 1
SGS1 SGS0
0 0
R/W R/W R/W
, COM , and
4 3
.
2
, COM , and COM output
4 3 2
and COM
4
outputs the same waveform
4
, and COM outputs the
3 2
.
1
.
4
.
4
0
0
.
1
.
3