RA8806 Datasheet, PDF (34/174 Pages) RAIO Technology Inc. – Two Layers Character/Graphic LCD Controller Specification

Preliminary Version 1.0
RA8806
Two Layers Character/Graphic LCD Controller
6-2-1 Display Resolution
RA8806 support many different resolution of LCD panel. For different resolution of panel, RA8806
could change the setting of some registers like DWWR and DWHR to modify display window size.
And use registers AWRR, AWBR, AWLR and AWTR to change the active window size.
For example, if 320x240 LCD panel is used, then the related register setting is as following:
DWWR = (320 / 8) - 1 = 39 = 27h
DWHR = 240 – 1 = 239 = EFh
The active window range is less than display window. So user has to care the rule as following:
1. AWRR ≥ AWLR ≥ DWWR
2. AWBR ≥ AWTR ≥ DWHR
RA8806 supports a variety of LCD modules, the setting of register depnding on different resolution
of LCD module is list at below table.
Table 6-5 : Registers Setting for LCM Resolution
Panel
Segment Common ^REG[21h]
Resolution
DWWR
REG[31h]
DWHR
160*80
160
80
13h
4Fh
160*128
160
128
13h
7Fh
160*160
160
160
13h
9Fh
240*64
240
64
1Dh
3Fh
240*128
240
128
1Dh
7Fh
240*160
240
160
1Dh
9Fh
320*240
320
240
27h
EFh
6-2-2 Display Window and Active Window
The RA8806 provides two windows for real application -- Display Window and Active Window. The
Display Window is the actual resolution of LCD panel. Active is a sub-window in Display Window.
The boundary of cursor shift depends on the active window. The relative registers of the two
windows are as the following table.
Table 6-6
Reg.
Bit_Num
Description
Reference
AWLR
AWRR
AWTR
AWBR
DWWR
DWHR
Bit [5:0]
Bit [5:0]
Bit [7:0]
Bit [7:0]
Bit [5:0]
Bit [5:0]
Define left boundary of the active window
Define right boundary of the active window
Define top boundary of the active window
Define bottom boundary of the active
window
Define the width of the display window
Define the height of the display window
REG[40h]
REG[20h]
REG[50h]
REG[30h]
REG[21h]
REG[31h]
RAiO TECHNOLOGY INC.
34/174
www.raio.com.tw