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Thanks, Edward !

Just this morning, I plunged deeply into the data sheets of XDP, and I found a sheme for the oscillator. Now all is OK.
So my problem is solved now.

Best regards.
Joel Petrique
Diese-Info
-----Message d'origine-----
De : 6...@yahoogroups.com [mailto:6...@yahoogroups.com] De la part de Edward Karpicz
Envoyé : mercredi 21 mars 2007 20:37
À : 6...@yahoogroups.com
Objet : Re: [68HC12] Oscillator from s12dp256 to s12Xdp512

wrote:

> Hye
>
> I'm trying to go from 9s12dp256 CPU to 9s12Xdp512, with the same printed
> board.
>
> I'm able to download and debug program (ICC12 ImageCraft V 7 compiler and
> NoIce debugger)
>
> But I think the CPU run with his internal clock, not quartz :
> - some functions (delay) developped before are very slow
> - the PLL doesn't run too.
>
> When I compare data sheets, I see
> dp256 family : Collpitts oscillator, so my scheme is
> - cond 22 pF between XTAL and EXTAL
> - quartz 12 Mhz between EXTAL and GND
> - cond 22 pF between XTAL and GND
> (I copy this oscillator from a learning board)
>

XDP doesn't support Collpits oscilator. /XCLKS selects not between Collpitts
and Pierce but between full-swing Pierce and loop-controlled Pierce. Just
search XDP512 datasheet for XCLKS, you will find quickly description and
oscilators schematics.
> XDP family : Pierce oscillator
>
> Who can help me for the scheme of that Pierce oscillator ?
>
> It seems the PLL circuit are the same, so I hope the PLL run with the same
> components with the two families...

It should work.

Edward

>
> Many thanks
> Best regards
>
> Joel Petrique
> Diese-Info
> Yahoo! Groups Links

Yahoo! Groups Links



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Hello,

Please do not use PLL filter components on the S12X before making sure
the stability is OK.

Look at
http://forums.freescale.com/freescale/board/message?board.id=16BITCOMM&message.id=1780
to download a small calculator to help you.

Clock is the heartbeat of the microcontroller and having it wrong
could mean a lot of work to change all boards.

Cheers,
Alban.

--- In 6...@yahoogroups.com, "Edward Karpicz" wrote:
>
> wrote:
>
> > Hye
> >
> > I'm trying to go from 9s12dp256 CPU to 9s12Xdp512, with the same
printed
> > board.
> >
> > I'm able to download and debug program (ICC12 ImageCraft V 7
compiler and
> > NoIce debugger)
> >
> > But I think the CPU run with his internal clock, not quartz :
> > - some functions (delay) developped before are very slow
> > - the PLL doesn't run too.
> >
> > When I compare data sheets, I see
> > dp256 family : Collpitts oscillator, so my scheme is
> > - cond 22 pF between XTAL and EXTAL
> > - quartz 12 Mhz between EXTAL and GND
> > - cond 22 pF between XTAL and GND
> > (I copy this oscillator from a learning board)
> > XDP doesn't support Collpits oscilator. /XCLKS selects not between
Collpitts
> and Pierce but between full-swing Pierce and loop-controlled Pierce.
Just
> search XDP512 datasheet for XCLKS, you will find quickly description
and
> oscilators schematics.
> > XDP family : Pierce oscillator
> >
> > Who can help me for the scheme of that Pierce oscillator ?
> >
> > It seems the PLL circuit are the same, so I hope the PLL run with
the same
> > components with the two families...
>
> It should work.
>
> Edward
>
> >
> > Many thanks
> > Best regards
> >
> > Joel Petrique
> > Diese-Info
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
>


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