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

13.2

Register Descriptions

13.2.1

LCD Port Control Register (LPCR)

Bit 7
DTS1
Initial value 0
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.
6 5
DTS0 CMX
0 0
R/W R/W
Duty Cycle Common Drivers
Static COM
1
COM
4
1/2 duty COM
2
COM
4
1/3 duty COM
3
COM
4
1/4 duty COM
4
Section 13 LCD Controller/Driver
4 3

SGS3 SGS2

0
W R/W R/W
Notes
(initial value) Do not use COM
COM .
2
to COM
COM , COM
1
4
the same waveform as COM
and COM Do not use COM
1
to COM COM outputs the same waveform
1 4
as COM
same waveform as COM
to COM Do not use COM
1
to COM Do not use COM
1
to COM —
1
Rev. 7.00 Mar 10, 2005 page 419 of 652
2 1 0
SGS1 SGS0
0 0 0
R/W R/W
, COM , and
4 3
, and COM output
3 2
1
and COM .
4 3
, and COM outputs the
3 2
.
1
.
4
.
4
REJ09B0042-0700
.