Catching a 12us (microsecond) wide signal

QAH

Hello! What do I need to do to catch a 12 microsecond wide rise fall signal? Do you use a PULSEIN command?

Basically an outside device is going to send my stamp that rise signal and when the signal falls my stamp will send back some data. So what is the best way to accomplish this?

By the way, I have a BS2

Thanks

Post Edited (QAH) : 1/9/2010 4:39:37 PM GMT

Tracy Allen

Assuming the Stamp can sit there and wait for the pulse, yes, PULSIN is the command to use. It may be necessary to put it in a loop, because it will only wait about a tenth of a second for each try. In the loop there is a small chance that it will miss an input pulse.

top:
DO
  PULSIN 1, 1, [noparse][[/noparse]result]
LOOP UNTIL result
  ' send back some data
GOTO top

If the program has to do other things while waiting, it will be necessary to stretch or latch the pulse so the Stamp can get to it at its own leisurely pace.

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Tracy Allen
www.emesystems.com