Lpc2000

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Von: Karl Olsen [mailto:kro@...] 
Gesendet: Montag, 6. Februar 2006 10:30
An: lpc2000@yahoogroups.com
Betreff: [lpc2000] Re: Rise and fall time of capture inputs

 
I don't think it is possible to miss a capture event because of slow 
rise/fall times.  You get a capture event when the input is e.g. low at 
one pclk edge and high at the next, and this will happen at least once 
no matter how slow the input rises.

[MEH]  This is an interesting fact. Thank you.
 
Another problem might be noise on the input so that you get multiple 
rise and fall events around the switching level.  The datasheets say 
that there is a hysteresis of typically 0.4V on all standard port pins 
and some more on the I2C pins, so this should filter most noise.

[MEH]  That's the reason my signal is so slow. It's filtered with an
EMI-Filter, so no flicker should be on the line.

Karl Olsen







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