>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 27 March 2006 14:21
>To: Piclist@mit.edu
>Subject: [PIC] 18f4620 why need rbpu?
>
>
>Why do we need pullups for portb of 18f4620 ?


Are you asking why PORTB has weak pullups built in?  If so it's simply a feature that Microchip has provided that is often usefull when used in conjunction with PORTB's interrupt on change feature.  It can allow a switch to be connected from the port pin to ground with no other components.

You do not have to use the pull-ups's, they can be disabled by the RBPU bit.

Regards

Mike

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