Lpc2000

--- In lpc2000@yahoogroups.com, "Huber Martin" <martinhuber@...> wrote:

> I think you have right, but I'm interesting where the limits are.
> Philips must have limits in fall and rise time but I can't find
> them in any datasheets. In my opinion this are important datas for
> developers in hardware.

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.

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.

Karl Olsen