hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 351

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

13.2.3
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
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 to the H8/3867 Series only)
When V
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
336
Bit
Initial value
Read/Write
CC
LCD Control Register 2 (LCR2)
is selected as the drive power supply, the step-up constant-voltage (5 V) power supply
Description
Drive using A waveform
Drive using B waveform
Description
Drive power supply is V
Drive power supply is 5 V, step-up constant-voltage (5 V) power supply operates
LCDAB
R/W
7
0
—
—
6
1
CC
, step-up constant-voltage (5 V) power supply halts
—
—
5
1
SUPS
R/W
4
0
CDS3
R/W
3
0
CDS2
R/W
2
0
CDS1
R/W
1
0
(initial value)
(Initial value)
CDS0
R/W
0
0