Renesas H8S Series User Manual page 15

Table 4 Internal Registers Used (cont)
Register Bit Name
LCR
PSW
ACT
DISP
CKS3
CKS2
CKS1
CKS0
REJ06B0486-0100/Rev.1.00
LCD Display Using 1/4 Duty Drive (LCD Controller/Driver)
Description
LCD control register
LCD power supply split-resistor connection control
This bit can be used to disconnect the LCD power
supply split-resistors from V
required in a power-down mode or when an external
power supply is used. When the ACT bit is cleared to
0, and also in the standby mode, the LCD power
supply split-resistors are disconnected from V
regardless of the setting of this bit.
• PSW = 0: LCD power supply split-resistors are
disconnected from V
• PSW = 1: LCD power supply split-resistors are
connected to V
CC
Display function activate
This bit 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 is also turned off, regardless of the
setting of the PSW bit. However, register contents are
retained.
• ACT = 0: LCD controller/driver operation disabled
• ACT = 1: LCD controller/driver operation enabled
Display data control
This bit specifies whether the contents of LCD RAM
are displayed or blank data is displayed regardless of
the LCD RAM contents.
• DISP = 0: Blank data is displayed
• DISP = 1: LCD RAM data is displayed
Frame frequency select 3 to 0
These bits select the clock source and frame
frequency.
• CKS3 = 0, CKS2 = 0, CKS1 = 0, CKS0 = 1:
φSUB/2 selected as the clock source and 64 Hz
selected as the frame frequency
March 2005
when LCD display is not
CC
CC
CC
H8S Family
Address Set Value
H'FFFFC1 H'31
Bit 6 0
Bit 5 1
Bit 4 1
Bit 3 CKS3 = 0
Bit 2 CKS2 = 0
Bit 1 CKS1 = 1
Bit 0 CKS0 = 1
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