Sorry, this is my first post. I forgot to tag the subject
line.

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Is there a way to compute the optimum value of pull up (or

pull down) resistors on PIC digital inputs?

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Most example circuits I have seen seem to use 10k. My

EasyPIC7 board uses 4k7. I have been experimenting and 20k

resistors produce unreliable results. I don't see anything

in the data sheet to help with this.=20

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I am using a pic16f877a. The leakage current is one

micro-amp. Sampling the port must draw considerably more. My

current project is not battery operated but, if it were, I

would like to use the largest resistors possible.

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Thanks,

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Allen

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