On Tue, 2004-02-24 at 22:06, Richard Mulvey wrote:
> Hi All:
>
>    I'm just starting out with PIC's, and have breadboarded
> a 16F877 with an oscillator composed of a 4Mhz parallel-cut crystal, and
> 15pf caps.  When I scope out OSC1 and OSC1, I don't see any
> oscillation.  I've tried a range of caps from 12 to 33pf.
>
>    The 16F877 is straight from the distributor - completely
> unprogrammed, since I haven't built a programmer yet.  ;-)
>
>    My question is:  Should I be seeing oscillation under these
> conditions?  Or do the configuration fuses need to be programmed first,
> before the oscillator will start?
>
>    It will be a couple of days before I have a programmer, so I'm
> curious whether I'm simply missing some other important factor, or if
> this is the default behavior with an unprogrammed PIC.
>


   Rudely following up on my own post... after figuring out that the
default config fuses would be set for an RC oscillator, I tried that,
and it worked fine.

   Slinking back under my rock, now....

- Rich

--
Richard Mulvey <rich@mulveyfamily.com>

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