On Tue, 2006-09-19 at 14:58 +0800, genome wrote:
> hello..
> Is it possible to drive 2 or 3 PIC's with only one crystal in HS+PLL mode to 
> operate them on the same frequency.. If so.. how may one do this?.
> 
> I read somewhere in some microchip appnotes... if I remember... that there 
> is an inverting amplifier inside the pic that causes the crystal to oscilate 
> the output of that amp is in osc2.. and input on osc1, something to do wth 
> the amp producing a 180degrees phase shift.. maybe somebody could explain 
> it.. this is why I'm having trouble the amp in the PIC is part of the 
> oscilator not just the crystal... is this correct?????? 

If you are using the PLL in the PIC, you can do this, however note that
while they will run at the same frequency, they may not be in phase by
default since the PLLs won't be able to lock at exactly the same time.

TTYL

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