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Thread: Xtal capacitor values
www.piclist.com/techref/microchip/time.htm?key=xtal
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face BY : David VanHorn email (remove spam text)



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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In reply to: <008101c0be00$711d58c0$1858b0c8@brusque>
See also: www.piclist.com/techref/microchip/time.htm?key=xtal
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