ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 35

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RAiO
TECHNOLOGY INC.
6-2-1 Display Resolution
6-2-2 Display Window and Active Window
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:
The active window range is less than display window. So user has to care the rule as following:
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.
RA8806 supports a variety of LCD modules, the setting of register depnding on different resolution
of LCD module is list at below table.
DWWR
DWHR
AWRR
AWBR
AWLR
AWTR
Reg.
DWWR = (320 / 8) - 1 = 39 = 27h
DWHR = 240 – 1 = 239 = EFh
1. DWWR ≥ AWRR ≥ AWLR
2. DWHR ≥ AWBR ≥ AWTR
Resolution
160*128
160*160
240*128
240*160
320*240
160*80
240*64
Panel
Bit_Num
Bit [5:0]
Bit [5:0]
Bit [7:0]
Bit [7:0]
Bit [5:0]
Bit [5:0]
Table 6-5 : Registers Setting for LCM Resolution
Segment Common
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
160
160
160
240
240
240
320
Table 6-6
128
160
128
160
240
80
64
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Description
Two Layers Character/Graphic LCD Controller
REG[21h]
DWWR
1Dh
1Dh
1Dh
13h
13h
13h
27h
REG[31h]
DWHR
EFh
4Fh
7Fh
9Fh
3Fh
7Fh
9Fh
Reference
REG[20h]
REG[21h]
REG[31h]
REG[40h]
REG[50h]
REG[30h]
www.raio.com.tw
RA8806