On Sat, 3 Jun 2006, Bob Axtell wrote:

> My measurements, done several years ago, simply setting the port I/O as input 
> and pulled down through a  10.0K 1% resistor and using scope measurements, 
> gave me a value of approx 53K. But since they don't guarantee these values, 
> they could have easily changed. I can't imagine it being very low, however.

It is better to plot the value with a resistor box. Since the pullups 
are actually PFETs they  almost stop sourcing current when the pin is 
near enough Vdd. I got bitten by this when trying to use such a pin to 
drive reset on another cmos device. Not good.

Peter
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