ra8835 Topway Display, ra8835 Datasheet - Page 49

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

RAiO TECHNOLOGY INC.
Version 1.7
7-13-4 Bi-directional Scrolling
7-13-5 Scroll Units
Bi-directional scrolling can be performed only if the display memory is larger than the physical
screen both horizontally and vertically. Although scrolling is normally done in single-character
units, the HDOT SCR command can be used to scroll horizontally in pixel units. The Single-pixel
scrolling of both horizontally and vertically can be performed by using the SCROLL and HDOT
SCR commands. See Section 17-4.
Note that in a divided screen, each block cannot be independently scrolled horizontally in pixel
units.
Before scrolling
After scrolling
Before scrolling
After scrolling
Figure 7-25: Horizontal Wraparound Scrolling
Text
Graphics
ABC
123
BC
23
Figure 7-26: Bi-directional Scrolling
BC
FG
TUV
Mode
EFG
TUV
Table-20B: Scroll Units
XYZ
XYZ1
Pixels
Characters
1234
12
56
Vertical
49/86
SAD1
SAD1
Pixels
Pixels or
characters
ABC
Horizontal
A BC
E FG
TUV
EFG
Display memory
TUV
C/R
AP
ABC
123
ABC
123
Display memory
1234
12 34
56 7
567
89
C/R
AP
89
Dot Matrix LCD Controller
XYZ
XYZ
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RA8835