Hi all, 

What is weak pullup ? The strength 'strong' or 'weak' related 
to voltage level or current level ? 

I am using PIC18f2525 and datasheet gives only 'weak' pullup current
and not resistor value,  Why it is ?. 

My another doubt is , Weak pullups are done by resistors or active 
components  ? ( Because, In academics, i have read somewhere , it is 
difficult to fabricate passive components on IC than active components).

regards,
palani.

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