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(2) Halftone display
The S1D13700 uses the DISP ON/OFF command's FP parameter to produce halftone display. This is
accomplished by flashing the screen at 15 Hz. However, because this method of display may cause display
to flicker, characteristics of the LCD module used must be carefully considered.
1 Menu pad display
[OR'ing by the layered function]
OVLAY
DISP ON/OFF
SAD1
A B
First layer
2 Graph display
[OR'ing by the layered function]
OVLAY
DISP ON/OFF
When displaying various data in the form of a graph for comparison purposes, this method of display is
very effective because two types of diagrams distinguishable by differences in contrast can be displayed.
(3) Area flashing
1 For flashing a few characters
Because the S1D13700 has a high-speed interface circuit, alternately rewriting the character and blank
codes from the MPU to flash characters is an appropriate method. In this case, the MPU rewrites
display data at intervals of 0.5 to 1.0 second as regulated by its internal timer.
2 For flashing a large area
Divide the first or second layer into halves with only the area required made to flash at 2 Hz, and
overlay the halved layer blocks by OR'ing.
Scroll
DISP ON/OFF
OVLAY
S1D13700 Technical Manual
P1 = 00H
Disable flashing of the first layer and enable flashing of the second
layer at 17 Hz, then overlay the first and second layers by OR'ing.
P1 = 34H
SAD2
P1 = 00H
Disable flashing of the first layer and enable flashing of the second
layer at 15 Hz, then overlay the first and second layers by OR'ing.
P1 = 34H
A B
X Y Z
Second layer
A B
EPSON
4: FUNCTION DESCRIPTION
Halftone
A B
A B
Screen
X Y Z
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