IIRC, a crystal takes the longest to get up and running in a stable=
=20
region.  Either of your RC methods ought to be faster.  But a crystal=
=20
doesn't typically take 72ms to get up to that region either, so if yo=
u=20
need the precise timing of a crystal and faster reaction you can use=
=20
other methods to shorten the start up time and still use a crystal - =
but=20
an RC should still start up faster.

-Adam

-Adam

Gabriel Caffese wrote:

>Hello everyone,
>
>  I have a time critical application, and I can=B4t enable the  POR,=
 and wait
>those 72ms.
> So, the question is:
> Wich of these configurations get sooner to the "stable zone" ??
>
>  1- 16F628 + internal 4mhz RC
>  2- 16F628 + 4mhz XTAL
>  3- 16F628 + R to ground, making it oscilate at 12 mhz
>
> Remember that the question is not wich runs faster. It=B4s which on=
e gets
>sooner to the "stable area"
>
>Thanks to everyone.-
>
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