RA8806
Preliminary Version 1.0
Two Layers Character/Graphic LCD Controller
REG [12h] Memory Access Mode Register (MAMR)
Bit
Description
Cursor Auto Shifting Direction
Default
Access
0 : Cursor moves horizontally (left to right) first then vertically (top to
down).
1 : Cursor moves vertically first then horizontally.
7
0
R/W
Note: In graphic mode, the cursor moving is treated as unit of bytes in
horizontal direction. At vertical direction, it’s treated as unit of bit. At
text mode, the bit is ignored, and the cursor moving is always in
horizontal direction.
Display Layer and Display Mode Selection
0 0 0 : Gray Mode. In this mode, each pixel consists with 2 continuous
bits in memory data. With the FRC methodology, 4-level-gray
mode is implemented. The bit mapping is list as below.
bit1
bit0
Gray
---------------------------------------------------
0
0
1
1
0
1
0
1
Level1 (Lightest)
Level2
Level3
Level4 (Darkest)
Note: Gray mode doesn’t support text-mode input.
6-4
001
R/W
0 0 1 : Show DDRAM1 data on screen.
0 1 0 : Show DRRAM2 data on screen.
0 1 1 : Show Two Layer Mode. The display rule depends on Bit-3 and
Bit-2 as following.
1 0 X : NA.
1 1 0 : Extension Mode (1), the panel will show both DDRAM1 and
DDRAM2 data on the screen. The RA8806 is available for
640x240 pixels panel.
1 1 1 : Extension Mode (2), the panel will show both DDRAM1 and
DDRAM2 on the screen. The RA8806 is available for 320x480
pixels panel.
Two Layer Mode Selection
Combine the data of DDRAM1 and DDRAM2 on the screen when
Bit[6:4] is set as “011”.
3-2
1-0
00
01
R/W
R/W
0 0 : DDRAM1 “OR” DDRAM2.
0 1 : DDRAM1 “XOR” DDRAM2.
1 0 : DDRAM1 “NOR” DDRAM2.
1 1 : DDRAM1 “AND” DDRAM2.
MPU Read/Write Layer Selection
0 0 : Access CGRAM.(512Byte)
0 1 : Access DDRAM1.
1 0 : Access DDRAM2.
1 1 : Access both DDRAM1 and DDRAM2 concurrently
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