ra8802 RAIO Technology Inc., ra8802 Datasheet - Page 18

• Manufacturer Part Number: ra8802
• Description: Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Version 1.3
RAiO
Note: REG[28h, 38h, 48h, 58h] is used to set Display Window。Users can set the viewing scope of Display
RAM. For RA8802, the Column Address can be set between 0~39, and Row Address can be set between
0~239. For RA8820, the Column Address can be set between 0~29, and Row Address can be set between
0~159. Users can set start and end address first, and then by adding shift function to present the effect of
rolling.
REG [38] Display Window Bottom Register (DWBR)
REG [48] Display Window Left Register (DWLR)
REG [58] Display Window Top Register (DWTR)
Note:
Please look at this example of how to set the default value of the Register.
1. AWRR≧CPXR≧AWBR, AWRR≧INTX≧AWBR
2. AWLR≧CPYR≧AWTR, AWLR≧INTY≧AWTR
7-0
7-0
7-0
Bit
Bit
Bit
TECHNOLOGY INC.
Display Window Bottom position
RA8802 : If LCD Panel is 320x240, the value of the register is:
RA8820 : If LCD Panel is 240x160, the value of the register is:
Display Window Left position
Usually set “00h”.
Display Window Top position
Usually set “00h”.
Common_ Bottom = LCD Common Number –1
240 – 1 = 239 = EFh
160 – 1 = 159 = 9Fh
Segment-Left
Common-Top
Description
Description
Description
Common-Bottom
18/18
Character/Graphic LCD Controller
RA8802/8820
www.raio.com.tw
Default
Default
Default
xxh
0h
0h
Access
Access
Access
R/W
R/W
R/W