HD6473887 Datasheet, PDF (363/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

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
SGX
0
R/W
3
SGS3
0
R/W
2
SGS2
0
R/W
1
SGS1
0
R/W
0
SGS0
0
R/W
LPCR is an 8-bit read/write register which selects the duty cycle and LCD driver pin functions.
LPCR is initialized to H'00 upon reset.
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
0
0
0
0
1
1
1
1
Bit 6
DTS0
0
Bit 5
CMX
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
Duty Cycle
Static
1/2 duty
1/3 duty
1/4 duty
Common
Drivers
COM₁
(initial value)
COM₄ to COM₁
COM₂ to COM₁
COM₄ to COM₁
COM₃ to COM₁
COM₄ to COM₁
COM₄ to COM₁
Notes
Do not use COM₄, COM₃, and
COM₂.
COM₄, COM₃, and COM₂ output
the same waveform as COM₁.
Do not use COM₄ and COM₃.
COM₄ outputs the same waveform
as COM₃, and COM₂ outputs the
same waveform as COM₁.
Do not use COM₄.
Do not use COM₄.
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