ra8835 Topway Display, ra8835 Datasheet - Page 29

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

RAiO TECHNOLOGY INC.
Version 1.7
6-4 Drawing Control Commands
6-3-7 HDOT SCR
6-4-1 CSRW
While the SCROLL command only allows scrolling by characters, HDOT SCR allows the screen to
be scrolled horizontally by pixels. HDOT SCR cannot be used on individual layers.
6-3-7-1 D0 to D2
Specifies the number of pixels to scroll. The C/R parameter has to be set to one more than the
number of horizontal characters before using HDOT SCR. Smooth scrolling can be simulated if the
controlling microprocessor repeatedly issues the HDOT SCR command to the RA8835 series. See
Section 9-5 for more information on scrolling the display.
The 16-bit cursor address register contains the display memory address of the data at the cursor
position as shown in Figure 6-22. Note that the microprocessor cannot directly access the display
memory. The MREAD and MWRITE commands use the address in this register.
M/N is the number of bits(dots) that parameter 1 (P1) is
incremented/decremented by.
HEX
Z
00
01
02
06
07
↓
P1
C
A
Z
MSB
A
Figure 6-20: HDOT SCR Parameters
Table-18: Scroll Step Selection
0
0
D2
B
A
Figure 6-21 Horizontal Scrolling
0
0
0
1
1
↓
P1
B
1
0
B
D1
0
0
1
↓
1
1
Display width
0
0
D0
0
1
0
0
1
↓
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1
0
Number of pixels to
1
0
X
X
D2
0
scroll
X
N
Y
0
1
2
6
7
↓
Y
D1
1
Y
D0
0
M = 0
N = 0
LSB
Dot Matrix LCD Controller
www.raio.com.tw
RA8835