h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 677

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

18.2.2
LCR is an 8-bit read/write register which performs LCD power supply split-resistance connection
control and display data control, and selects the frame frequency.
LCR is initialized to H'80 upon reset and in standby mode.
Bit 7—Reserved: This bit is always read as 1 and cannot be modified.
Bit 6—LCD Power Supply Split-Resistance Connection Control (PSW): Bit 6 can be used to
disconnect the LCD power supply split-resistance from V
power-down mode, or when an external power supply is used. When the ACT bit is cleared to 0,
and also in standby mode, the LCD power supply split-resistance is disconnected from V
regardless of the setting of this bit.
Bit 5—Display Function Activate (ACT): Bit 5 specifies whether or not the LCD
controller/driver is used. Clearing this bit to 0 halts operation of the LCD controller/driver. The
LCD drive power supply ladder resistance is also turned off, regardless of the setting of the PSW
bit. However, register contents are retained.
Bit 6
PSW
0
1
Bit 5
ACT
0
1
Bit
Initial value
Read/Write
LCD Control Register (LCR)
Description
LCD power supply split-resistance is disconnected from V
LCD power supply split-resistance is connected to V
Description
LCD controller/driver operation halted
LCD controller/driver operates
—
—
7
1
PSW
R/W
6
0
ACT
R/W
5
0
DISP
R/W
4
0
Rev. 5.00 Sep 22, 2005 page 651 of 1136
CC
CKS3
when LCD display is not required in a
R/W
3
0
CC
Section 18 LCD Controller/Driver
CC
CKS2
R/W
2
0
REJ09B0257-0500
CKS1
R/W
1
0
(Initial value)
(Initial value)
CC
CKS0
R/W
0
0