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'[PIC]: Xtal capacitor values'
2001\04\05@144559 by Edson Brusque

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Hello,

   I have a board where the PIC (16F877) isn't starting (booting).
Sometimes, when I plug it it starts and works ok, but then I reset and it
doesn't work again.

   Raising or lowering the xtal capacitors values could help? Xtal is
20MHz, capacitors 33pF, also tried with 22pF and with no caps, same result.

   Thanks,

   Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2685  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
http://www.citronics.com.br
-----------------------------------

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2001\04\05@152447 by David VanHorn

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At 03:43 PM 4/5/01 -0300, Edson Brusque wrote:
>Hello,
>
>     I have a board where the PIC (16F877) isn't starting (booting).
>Sometimes, when I plug it it starts and works ok, but then I reset and it
>doesn't work again.
>
>     Raising or lowering the xtal capacitors values could help? Xtal is
>20MHz, capacitors 33pF, also tried with 22pF and with no caps, same result.


Allow me to refer you to my page on Xtals:
http://www.dvanhorn.org/Micros/All/Crystals.php

It sounds like you have a power or bypass problem as well, but if you're
guessing cap values, this is worth a read-thru.

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