28123 Parallax Inc, 28123 Datasheet - Page 59

• 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

A Diagnostic Test for your Computer
A very few computers, such as some laptops, will halt the PBASIC program after the first
time through a
By placing a
prevents this from possibly happening. You will next re-run this program without the
DEBUG
not likely, but it would be important for you to know.
If the LED blinks on and off continuously, just as it did when you ran the original
program with the
If the LED blinked on and off only once and then stopped, you have a computer with a
non-standard serial port design. If you disconnect the serial cable from your board and
press the Reset button, the BASIC Stamp will run the program properly without freezing.
In programs you write yourself, you should add a single command:
right after the compiler directives. This will open the Debug Terminal and keep the
COM port open. This will prevent your programs from freezing after one pass through
the
chapters. You will see this command in some of the example programs that would not
√
√
√
DO…LOOP
command to see if your computer has this non-standard serial port problem. It is
Open LedOnOff.bs2.
Delete the entire
Run the modified program while you observe your LED.
DEBUG "Program Running!"
, or any of the other looping commands you will be learning in later
DEBUG
DO...LOOP
DEBUG
command the program LedOnOff.bs2, the open Debug Terminal
command, your computer will not have this problem.
DEBUG
loop. These computers have a non-standard serial port design.
DO
LOOP
HIGH 14
PAUSE 250
LOW 14
PAUSE 250
instruction.
Figure 2-12
DO…LOOP
The code between the
keywords DO and
LOOP get executed
over and over again.