> What was bother me is the accuracy Wouter, that what I mean.
> Thanks Anyway :-)

There are graphs in the datasheet. For absolute accuracy the tolerance of
the C (10%?) will have a big influence. Over the temperature range the PIC
has a big influenece. If you can live with an accuracy 20% or so an external
RC is a good (and cheap) idea.

Wouter

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