RA8806
Preliminary Version 1.0
Two Layers Character/Graphic LCD Controller
REG [40h] Active Window Left Register (AWLR)
Bit
Description
Default
Access
Reserved
7-6
00
R
Active Window Left Position Æ Segment-Left
5-0
00h
R/W
Note: AWLR must be equal or less then AWRR, and less then the
value 27h(39 in decimal)
REG [50h] Active Window Top Register (AWTR)
Bit
Description
Default
Access
Active Window Top Position Æ Common-Top
7-0
00h
R/W
Note: AWTR must be equal or less then AWBR, and less then the
value EFh (239 in decimal)
REG [60h] Cursor Position X Register (CURX)
Bit
Description
Default
Access
Reserved
7-6
00
R
Cursor Position of Segment / RAM0 Address[4:0]
Define the cursor address of segment, a value from 0h ~ 27h(0 ~ 40 in
decimal)
5-0
00h
R/W
When CGRAM write mode is selected (REG[12h] Bit[1:0] = 00b), the
Bit[4:0] is the address for writing bit-map data. When create a full-size
font, normally set to 0. When create an odd half-size font, normally set
to 0, and set 10h for even font.
REG [61h] Begin Segment Position Register of Scrolling (BGSG)
Bit
Description
Default
Access
Reserved
7-6
00
R
Segment Start Position of Scrolling Mode
REG[61h] defines the start position (left boundary) of scroll window, it
must be a value that less or equal to the REG[62h], which defines the
end position(right boundary) of scroll window. Also it must be less
then the value of 27h (40 in decimal), for the Display Data RAM limit.
5-0
00h
R/W
Note:
REG[61h, 62h, 71h, 72h] dominate a named scroll window for scroll function. They must be set before the
scroll function is enable.
REG [62h] End Segment Position Register of Scrolling (EDSG)
Bit
Description
Default
Access
Reserved
7-6
00
R
Segment End Position of Scrolling Mode
REG[62h] defines the end position(right boundary) of scroll window, it
must be a value that larger or equal to the REG[61h], which defines
the end position(left boundary) of scroll window. Also it must be less
or equal then the value of 27h(40 in decimal), for the Display Data RAM
limit.
5-0
00h
R/W
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