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'[pic]: oscillator for pic 18F452'
2003\01\24@173540 by rad0

picon face
where can you get parallel cut crystal oscillators for
this chip

I want to use the HS+PLL option

and what I have doesn't seem to be working.

I wanted to try the 10mhz X 4 arrangement to
see what the 40Mhz would give me?

So I need a 10Mhz ceramic resonator from
a parallel cut crystal -- I guess.

Where can you get these?


thanks

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2003\01\24@175604 by Larry Bradley

flavicon
face
Digikey - part number X443-XD 10 mHz parallel xtal (18 pf)  - $0.80 each. I
just got 5 of them. You need two 18pf caps, of course.

Larry

At 04:33 PM 1/24/2003 -0600, you wrote:
{Quote hidden}

Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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2003\01\24@175810 by Dave Dilatush

picon face
rad0 wrote...

>where can you get parallel cut crystal oscillators for
>this chip

There's some confusion of terms here.  You can get "parallel cut
crystals" which work with the PIC's oscillator, or you can get a
"crystal oscillator" which contains a crystal **AND** an
oscillator circuit.  These are two different things, and I assume
you want the former.  AFAIK, all PICs are the same or very
similar with regard to their crystal oscillator circuits; they
all work with parallel-cut crystals (in contrast to series-cut
crystals, with which they are not intended to be used).  A
crystal which works for one, should work for nearly all of them.

>I want to use the HS+PLL option
>and what I have doesn't seem to be working.

(It would have been useful to know what you have, but you didn't
say; nor did you say what it was doing or not doing.)

>I wanted to try the 10mhz X 4 arrangement to
>see what the 40Mhz would give me?

It gives you speed.  BLAZING speed.  A PIC at 40MHz runs like a
striped-ass ape, believe me.

>So I need a 10Mhz ceramic resonator from
>a parallel cut crystal -- I guess.

Crystals give very high frequency accuracy, in the range of +/-
0.01% or so.  If you don't need quite that, a ceramic resonator
will do.  Several companies make ceramic resonators with the
appropriate load capacitors already built in; they're very handy.
DigiKey sells them, other distributors do too.

>Where can you get these?

I've been using these resonators from ECS, Inc.:

http://www.digikey.com/scripts/us/dksus.dll?Detail?Ref=84938&Row=314016

Hope this helps...

Dave D.

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2003\01\24@180221 by Olin Lathrop

face picon face
> where can you get parallel cut crystal oscillators for
> this chip

What chip?  Digikey has lots of crystals that work with PICs, if that's
what you are looking for.

> I want to use the HS+PLL option
>
> and what I have doesn't seem to be working.
>
> I wanted to try the 10mhz X 4 arrangement to
> see what the 40Mhz would give me?

I just bought a few 10MHz crystals for exactly this purpose.  Digikey
X443-ND, $.72 each if you buy 10.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

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2003\01\24@182831 by rad0

picon face
It turns out that the oscillators are alright.

I just upgraded my software, and it seems that MPASM is
not working or setup properly.

I am using microcode studio with picbasic pro and the melabs
loader, and when using 18F452 pics this software needs mpasm
to handle the 18Fxxx.

I changed back to the 16F877 and it didn't work correctly either.
using mpasm.

removed mpasm and used PBP's built in assembler and everything
seems fine.

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