RA8835A
Version 1.0
Dot Matrix LCD Controller
8-5 Layered Display Attributes
RA8835A series incorporates a number of functions for enhanced displays using monochrome LCD
panels. It allows the display of inverse characters, half-intensity menu pads and flashing of selected
screen areas. These functions are controlled by the OVLAY and DISP ON/OFF commands.
A number of means can be used to achieve these effects, depending on the display configuration.
These are listed below. Note, however, that not all of these can be used in the one layer at the same
time.
Combined layer
Attribute
Reverse
MX1 MX0
1st layer display
2ndt layer display
display
0
1
RAIO
RAIO
IV
IV
ME
BL
1
0
1
0
Yes,No
Error
Yes, No
ME
Half-tone
1
0
1
0
Error
Local flashing
BL
0
0
1
0
LINE
LINE
LINE
LINE
Ruled line
0
1
1
1
RL
RL
Figure 8-8: Layer Synthesis
8-5-1 Inverse Display
The first layer is text, the second layer is graphics.
1. CSRW, CSDIR, MWRITE
Write is into the graphics screen at the area to be inverted.
2. OVLAY: MX0 = 1, MX1 = 0
Set the combination of the two layers to Exclusive-OR.
3. DISP ON/OFF: FP0 = FP1 = 1, FP1 = FP3 = 0.
Turn on layers 1 and 2.
RAiO TECHNOLOGY INC.
www.raio.com.tw
72/88
RAIO [ RAIO TECHNOLOGY INC. ]
