ra8835 Topway Display, ra8835 Datasheet - Page 43

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

RAiO TECHNOLOGY INC.
Version 1.7
7-11-2 Cursor Movement
7-11-3 Cursor Display Layers
Note that the cursor may disappear from the display if the cursor address remains outside the
displayed screen memory for more than a few hundred milliseconds.
On each memory access, the cursor address register changes by the amount previously
specified with CSRDIR, automatically moving the cursor to the desired location.
Although the RA8835 series can display up to three layers, the cursor is displayed in only one of
these layers: Two-layer configuration: First layer (L1) Three-layer configuration: Third layer (L3)
The cursor will not be displayed if it is moved outside the memory for its layer. Layers may be
swapped or the cursor layer moved within the display memory if it is necessary to display the
cursor on a layer other than the present cursor layer.
Although the cursor is normally displayed for character data, the RA8835 series may also display
a dummy cursor for graphical characters. This is only possible if the graphics screen is displayed,
the text screen is turned off and the microprocessor generates the cursor control address.
Consider the example of displaying Chinese characters on a graphics screen. To write the
display data, the cursor address is set to the second screen block, but the cursor is not displayed.
To display the cursor, the cursor address is set to an address within the blank text screen block.
Since the automatic cursor increment is in address units, not character units, the controlling
microprocessor must set the cursor address register when moving the cursor over the graphical
characters.
Figure 7-18: Cursor Display Layers
FC1=0
FC0=1
D=1
FP1=0
FP0=0
FP3=0
FP2=1
Cursor ON
Block screen 1(charac
Block screen 2(graphics
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terscreen) OFF
screen) ON
Dot Matrix LCD Controller
www.raio.com.tw
RA8835