HD64F38024HV Datasheet, PDF (439/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 13 LCD Controller/Driver
13.2.2 LCD Control Register (LCR)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
⎯
PSW ACT DISP CKS3 CKS2 CKS1 CKS0
1
0
0
0
0
0
0
0
⎯
R/W R/W R/W R/W R/W R/W R/W
LCR is an 8-bit read/write register which performs LCD drive power supply on/off control and
display data control, and selects the frame frequency.
LCR is initialized to H'80 upon reset.
Bit 7—Reserved
Bit 7 is reserved; it is always read as 1 and cannot be modified.
Bit 6—LCD Drive Power Supply On/Off Control (PSW)
Bit 6 can be used to turn the LCD drive power supply off when LCD display is not required in a
power-down mode, or when an external power supply is used. When the ACT bit is cleared to 0,
or in standby mode, the LCD drive power supply is turned off regardless of the setting of this bit.
Bit 6
PSW
0
1
Description
LCD drive power supply off
LCD drive power supply on
(initial value)
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 is also turned off, regardless
of the setting of the PSW bit. However, register contents are retained.
Bit 5
ACT
0
1
Description
LCD controller/driver operation halted
LCD controller/driver operates
(initial value)
Rev. 8.00 Mar. 09, 2010 Page 417 of 658
REJ09B0042-0800