HD6473847RHV Datasheet, PDF (364/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 13 LCD Controller/Driver
13.3.2 LCD Control Register (LCR)
LCR controls LCD drive power supply and display data, and selects the frame frequency.
Initial
Bit
Bit Name Value R/W Description
7
—
1
—
Reserved
This bit is always read as 1 and cannot be modified.
6
PSW
0
R/W LCD Drive Power Supply Control
Can be used to disconnect the LCD drive power supply
from Vcc when LCD display is not required in 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 drive power supply is disconnected from
Vcc regardless of the setting of this bit.
0: LCD drive power supply is disconnected from Vcc
1: LCD drive power supply is connected to Vcc
5
ACT
0
R/W Display Function Activate
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.
0: LCD controller/driver operation halted
1: LCD controller/driver operation enabled
4
DISP
0
R/W Display Data Control
Specifies whether the LCD RAM contents are displayed
or blank data is displayed regardless of the LCD RAM
contents.
0: Blank data is displayed
1: LCD RAM data is displayed
3
CKS3
0
R/W Frame Frequency Select 3 to 0
2
CKS2
0
1
CKS1
0
0
CKS0
0
R/W Select the operating clock and the frame frequency. In
R/W ^{subactive mode, watch mode, and subsleep mode, the}
system clock (φ) is halted, and therefore display
R/W _{operations are not performed if one of the clocks from φ/2}
to φ/256 is selected. If LCD display is required in these
modes, φ_W, φ_W/2, or φ_W/4 must be selected as the
operating clock.
For details, see table 13.4.
Rev. 7.00 Mar. 08, 2010 Page 332 of 510
REJ09B0024-0700