Ah yes, good point... I'm running FOSC =3D HSHP (which is high power for=20
20Mhz as it was on initially).  AFAIK, LP (or XT) would only reduce=20
current to that osc circuit for lower power consumption, so HS should=20
work fine at 8Mhz, but just draw more power.

Cheers,
-Neil.



On 8/27/2014 3:32 PM, Isaac Marino Bavaresco wrote:
> On 27/08/2014 15:36, Neil wrote:
>> (3) Without recompiling or reflashing (to ensure that there's no
>> different optimization going on), I just changed the 8Mhz crystal to
>> 4Mhz so it's running at 16Mhz now (with the PLL on).  This works again..=
..
>> http://veisystems.com/stuff/2014-08-27-PIC-HS-Issue-03-16Mhz%28PLL%29-GO=
OD.gif
>
> Some PICs must be configured differently to run from a crystal up to
> 4MHz (XT) than when running with higher frequency crystals (HS).
> Your problem may be unrelated to that, or not.
>
> The XT and HS configurations change the gain of the amplifier in the
> oscillator circuit and can make the PIC to run erratically.
>
>
> Isaac
>
>
>

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