Discussion
Toggling a spare output pin is a useful debugging technique because it
Answer: C
Correct answer: costs a few cycles and can be watched externally
Setting a pin on entry and clearing it on exit costs almost nothing, does not stop the processor, and can be watched on a scope or analyser while the system runs at full speed. That makes it the technique of choice for anything timing-sensitive, where a breakpoint would change the behaviour being investigated and printing would be far too slow.
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