The way I do it.....poppycock.

I quoted the 8051 "bible" and showed exactly why an 8051 variant with a sampled polled interrupt input will not capture an interrupt edge signalled by a 4 to 10 nanosecond crash logic pulse.

Don't go off excusing your self with more hoopla about your glitch generating idea for edge detection. Particularly when it is not usable as presented for the discussion at hand. You would go a long way toward credibility to show how that idea needs improvement in order to be applicable.

Beholding so much poppycock.

Michael Karas