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Does anyone have any visual examples?
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Interrupts are the events that temporarily suspend the main program, pass the control to the external sources and execute their task. It then passes the control to the main program where it had left off.
Answer: the oval symbol is used to start or stop a flow chart.
Typically interrupts communicate with your "main" function (or other interrupts for that matter) through the use of "shared" global variables in C-based embedded systems. I think a sensible way to represent this in a flow chart is to use a dashed line between processing blocks where such "communications" impact program flow.
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