Internal pull-ups

Technical discussions around xCORE processors (e.g. General Purpose (L/G), xCORE-USB, xCORE-Analog, xCORE-XA).
yzoer
XCore Addict
Posts: 132
Joined: Tue Dec 15, 2009 10:23 pm

Internal pull-ups

Postby yzoer » Thu May 10, 2012 5:27 am

Quick question with regards to the internal pull-ups. I can't find it for the life of me (naturally) but I seem to recall somewhere that the internal pull-ups cannot be guaranteed for multi-bit ports.

First question is whether or not the internal pull-ups are sufficient to drive simple switches without external pull-ups. Second question is, if yes, whether or not the above statement is true or not..

I'll see if I can track that doc down somewhere to refresh my memory...

Cheers,

-Y
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Andy
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Joined: Fri Dec 11, 2009 1:34 pm

Postby Andy » Thu May 24, 2012 8:40 pm

Hi yzoer,

The I/O on the L series has internal pull downs not pull ups. They are not strong enough to guarantee a defined external value and shouldn't be used in place of resistors.
yzoer
XCore Addict
Posts: 132
Joined: Tue Dec 15, 2009 10:23 pm

Postby yzoer » Thu May 24, 2012 9:07 pm

Figured as much :-) Thanks for the reply!

-Yvo

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