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PIC18LF6720 Xtal oscillator problem at 3.3V

 
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ik1wvq



Joined: 21 Feb 2004
Posts: 20

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PIC18LF6720 Xtal oscillator problem at 3.3V
PostPosted: Tue Sep 07, 2004 8:25 am     Reply with quote
hi,

this is my problem:

PIC18LF6720

*** 3.3 V ***

4 MHz Xtal with 15pF capacitors
XT configured
NOBROWNOUT

no (or extremely instable) oscillation !!

i tried XT.HS.LP configuration with no results

Anyone can help me ???

thanks

Mauro ik1wvq
cbstieff



Joined: 09 Aug 2004
Posts: 7
Location: Kensington, MD

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PostPosted: Wed Sep 08, 2004 1:06 am     Reply with quote
Check your crystal specifications carefully. I looks to me that the Capacitors may be to small (should be between 22pF and 35pF). If the caoacitor are to small the clock circuit will not oscillate.
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