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'[PICLIST] Help! 16F84A's not oscillating'
2001\02\02@215300 by Andy N1YEW

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Hello,

I have used the 16f84s before and had no trouble with the oscillator in XT mode using a 4mhz crystal with no caps.

now i am using 16f84a's and they dont oscillate using the same exact crystal with no caps in either XT or HS

Any Hints?

Andy

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2001\02\02@215913 by Bob Ammerman

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Yeah, add the caps.

Your previous 'luck' with the 16F84 was just that: 'luck'.

You were depending on behavior that was out of spec.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\02\02@221730 by David VanHorn

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At 10:03 PM 2/2/01 -0500, Andy N1YEW wrote:
>Hello,
>
>I have used the 16f84s before and had no trouble with the oscillator in XT
>mode using a 4mhz crystal with no caps.
>now i am using 16f84a's and they dont oscillate using the same exact
>crystal with no caps in either XT or HS
>Any Hints?


May I refer you to http://www.dvanhorn.org/Micros/All/Index.php ?

You need the caps. Just because something "worked", dosen't mean it's right.
The "crystals" article is a short treatment on using crystals with
microcontrollers.


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2001\02\03@100037 by Peter L. Peres

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>You were depending on behavior that was out of spec.

I confess that I've run PIC Xtals capacitorless in a solderless
breadboard. The capacitance of the breadboard combs apparently makes up
for the missing parts. I would not dare to do this with a production unit
of course.

Peter

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