ra8835 Topway Display, ra8835 Datasheet - Page 47

• Manufacturer Part Number: ra8835
• Description: Dot Matrix Lcd Controller
• Manufacturer: Topway Display

RAiO TECHNOLOGY INC.
Version 1.7
7-13 Scrolling
Back layer
Character
7-13-1 On-page Scrolling
code
The controlling microprocessor can set the RA8835 series scrolling modes by overwriting the scroll
address registers SAD1 to SAD4, and by directly setting the scrolling mode and scrolling rate.
The normal method of scrolling within a page is to move the whole display up one line and erase
the bottom line. Since the RA8835 series does not automatically erase the bottom line, it must be
erased with blanking data when changing the scroll address register.
SAG
SAD2
SAD1
4A00
F000
0000
0030
0040
4440
4800
0800
SL1
2000
2800
SL2
Character generator
Character generator
Figure 7-22: Memory Map and Magnified Characters
Not used
Page 1
Page 2
Page 1
Page 2
ROM
RAM
47/86
HEX
D7
Example of character A
F8
70
88
88
88
88
88
00
A (Code)
B
C
X
Y
α
β
X
γ
D7
01110000
10001000
10001000
10001000
11111000
10001000
10001000
00000000
to
D0
D0
0000
02FF
0080
1FFF
#4800
#4800
1
2
3
4
5
6
(MSB)
D7
Dot Matrix LCD Controller
Magnified image
(LSB)(MSB)
D0
ABC
D7
www.raio.com.tw
α
Display
RA8835
XY
(LSB)
D0
β