piclist 2000\11\12\161324a >
Thread: Crystals and Cap's
www.piclist.com/techref/microchip/devices.htm?key=pic
flavicon
face BY : Digital Signal Processing email (remove spam text)



> The data book dosen't tell you what value caps to use. The crystal spec
does.

Yes sorry. I meant the spec on the crystal. It says Load Capacitance = 16pF

I swapped it for two 16MHz crystals and still nothing and changed the Caps
to 2*16pF rather than 2*22pF and still nothing. Yet when I put on a 10MHz
XTAL it all sprang into life. Weird.

The microchip site lists something about putting a parallel resistor across
OSC1 and OSC2. I tried 2Mohm and still nothing.

I'll just keep trying.

I have set the XTAL mode of the PIC to be HS (although XT or HS didn't make
any difference to the non-working setup)

Oh and I've also tried a 20MHz crystal as well and still nothing. I must be
doing something really silly. Why will the 10MHz one work and not the 16MHz.
Surely it can ony be the capacitance? Do I just try loads of different
capacitances?

Thanks for the replies.

Peter

--
http://www.piclist.com hint: To leave the PICList
piclist-unsubscribe-requestspammitvma.mit.edu





seeking: microchip devprogs programmer
<001601c04ced$917814e0$242aff3e@atlas800> 7bit

See also: www.piclist.com/techref/microchip/devices.htm?key=pic
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) Crystals and Cap's

month overview.

new search...