RA8835A
Version 1.0
Dot Matrix LCD Controller
8-5-2 Half-tone Display
The FP parameter can be used to generate half-intensity display by flashing the display at 17 Hz.
Note that this mode of operation may cause flicker problems with certain LCD panels.
Half-tone
SAD1
AB
SAD2
AB
+
1st layer
2nd layer
Combined layer display
Figure 8-9: Half-tone Character and Graphics
8-5-2-1 Menu pad display
1. OVLAY: P1 = 00H
2. DISP ON/OFF: P1 = 34H
8-5-2-2 Graph display
To present two overlaid graphs on the screen, configure the display as for the menu bar display
and put one graph on each screen layer. The difference in contrast between the half- and full-
intensity displays will make it easy to distinguish between the two graphs and help create an
attractive display.
1. OVLAY: P1 = 00H
2. DISP ON/OFF: P1 = 34H
8-5-3 Flashing Area
8-5-3-1 Small area
To flash selected characters, the MPU can alternately write the characters as character codes and
blank characters at intervals of 0.5 to 1.0 seconds.
8-5-3-1 Large area
Divide layer 1 and layer 2 into two screen blocks each, layer 2 being divided into the area to be
flashed and the remainder of the screen. Flash the layer 2 screen block at 2 Hz for the area to be
flashed and combine the layers using the OR function.
ABC
ABC
XYZ
XYZ
Figure 8-10: Localized Flashing
RAiO TECHNOLOGY INC.
www.raio.com.tw
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RAIO [ RAIO TECHNOLOGY INC. ]
