It will be easier for you to acquire a 555 timer -- you can get them anywhere. There's a link, above, that shows how to configure it as a Schmitt trigger. The 555 has a driven output. run it at 5v and put a 3.3K (or higher) resistor between the 555 and the Propeller. Even if this isn't in your final design, you can prototype this quickly and work out your code.
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