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4.2
LED Lighting Control
The LEDs are connected to the ports on the OPCNT control IC as shown
in the figure below. These ports are configured internally as drivers. When
the LED lighting signal arrives from the MPU, the driver turns ON, and
current flows to the LED to light the LED. Once an LED has lit, the lit
state of the LED continues until the lighting OFF signal arrives from the
MPU.
4.3
Display Indication Control
When LCD code data arrives from the MPU, this data is sent to the LCD
module via the OPCNT control IC. The character generator (CG) of the
LCD module converts the LCD code data to data for LCD display (data
that indicates which
data that has arrived.
LED lighting signal from SCNT board
OPCNT
control IC
Fig. 6-23 LED Lighting Control
pixel
is to be output as black) based upon the code
FACSIMILE SYSTEM
ON
1
2
+5V
3
4
5
6
ït
çi
6–21
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