If I remember correctly, the power-up timer is intended to prevent the chip
from trying to start before the clock has stabilized. Crystal oscillators,
because of their high Q, take tens of milliseconds to reach a
steady-amplitude stable oscillation state. The reason why they allow you to
disable this timer is probably for cases where the clock is provided by an
RC oscillator (which start much more quickly) or by and external clock
source which has already stabilized before power is applied to the PIC.

Sean

At 02:55 PM 5/8/01 -0400, you wrote:
>>_PWRTE
>
>This is the power-up timer.  I'm not sure of the specifics of how it works,
>but I think basically it sets up a timer (72ms?) after power-up to allow
>time for the chip's hardware to stabilize.  I usually have this turned ON.

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