At 12:22 PM 2/16/01 +1300, you wrote:

>Now that I know I'm measuring a good PIC correctly, then this
>dv/dt limitation is also a fact of life, even though I expected an
>ST to detect slowly decreasing voltages and generate an IRQ
>(slowly increasing ones ARE detected reliably) ?

Yes, for the interrupt you should have no problem with
clean slow-changing voltages. Note though that Microchip does
not guarantee the minimum amount of hysteresis. It would be
imprudent to assume it must be larger than about 30 millivolts,
IMO, or less than maybe 0.3 volt.

Best regards,

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