>A variation of this is how I determine if my interrupt routines
>are overrunning. In this case, I turn ON the signal when the
>interrupt starts, and turn it OFF when the interrupt ends. On
>the scope, you should see only tiny slivers of ON time; if you
>are getting LONG  on times, you are overrunning the interrupt.

This is also a good trick for determining the interrupt latency from an 
external event. 

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