How to illustrate an interrupt-driven process?

Question

This question is related to diagraming a software process. As an electrical engineer, much of the software I do is for embedded micro-controllers. In school, we learned to illus

Answer 1

I've always seen interrupt timing drawn as follows:

Or inline line so:

But I prefer the former as it gives more room for annotation.

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In response to your comment, perhaps a UML state machine diagram (with some adaptation) may be closer suited to your purpose: