28123 Parallax Inc, 28123 Datasheet - Page 181

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Programming the 7-Segment LED Display Test
The
segment, one at a time, simply place the
and use the index to set the I/O pin, high, then low again.
Example Program: SegmentTestWithHighLow.bs2
' What's a Microcontroller - SegmentTestWithHighLow.bs2
' Individually test each segment in a 7-Segment LED display.
HIGH
√
√
√
Parallel Device: The 7-segment LED display is called a parallel device because you have
to use more than one I/O line at a time to send data (high and low information) to the device.
In the case of this 7-segment LED display, it takes 8 I/O pins to instruct the device what to
do.
Parallel Bus: The wires that transmit the
7-segment LED display are called a parallel bus. Note that these wires are drawn as
parallel lines in Figure 6-10. The term parallel kind of makes sense given the geometry of
the schematic.
Enter and run SegmentTestWithHighLow.bs2.
Verify that every segment in the 7-segement LED display lights briefly,
turning on and then off again.
Record a list of which segment each I/O pin controls.
and
LOW
commands will accept a variable as a pin argument. To test each
E
D
C
DP
G F A B
HIGH
HIGH/LOW
and
LOW
Figure 6-11
Wiring Diagram for
Figure 6-10
Use the segment
letters above this
diagram as a
reference.
signals from the BASIC Stamp to the
commands in a
FOR…NEXT
loop,