HD6473887 Datasheet, PDF (367/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

13.2.3 LCD Control Register 2 (LCR2)
Bit
7
6
LCDAB —
Initial value
0
1
Read/Write
R/W
—
5
4
3
2
1
0
—
SUPS CDS3 CDS2 CDS1 CDS0
1
0
0
0
0
0
—
R/W
R/W
R/W
R/W
R/W
LCR2 is an 8-bit read/write register which controls switching between the A waveform and B
waveform, selects the drive power supply, controls the step-up constant-voltage (5 V) power
supply, and selects the duty cycle of the charge/discharge pulses which control disconnection of
the power supply split-resistance from the power supply circuit.
LCR2 is initialized to H'60 upon reset.
Bit 7: A waveform/B waveform switching control (LCDAB)
Bit 7 specifies whether the A waveform or B waveform is used as the LCD drive waveform.
Bit 7
LCDAB
0
1
Description
Drive using A waveform
Drive using B waveform
(initial value)
Bits 6 and 5: Reserved bits
Bits 6 and 5 are reserved; they are always read as 1 and cannot be modified.
Bit 4: Drive power supply select, step-up constant-voltage (5 V) power supply control (SUPS)
(Applies only to the H8/3887 Series)
When V_CC is selected as the drive power supply, the step-up constant-voltage (5 V) power supply
simultaneously stops operating; when 5 V is selected as the drive power supply, the step-up
constant-voltage (5 V) power supply simultaneously operates.
Bit 4
SUPS
0
1
Description
Drive power supply is V_CC, step-up constant-voltage (5 V) power supply halts
(Initial value)
Drive power supply is 5 V, step-up constant-voltage (5 V) power supply operates
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