are you using a decoupling cap with the pic? ----- Original Message ----- From: Fowler, Paul B. To: Sent: Sunday, March 10, 2002 8:05 PM Subject: Re: [PIC]: PIC crystal... > ...and what can cause my PIC16F84A-20P to work with a 4MHz resonator but not > a 20MHz resonator? > > I have tried two different 20 MHz resonators and the chip doesn't work with > either... 4MHz is just fine. The application is a simple LED turn on and > keep on, so speed should make no difference. > > Any ideas? - Programmed with MPLab and the properties for the project > specify 20MHz. XT is specified as the type... > > I don't need the extra speed at the moment, but I am curious what I might be > missing. My tools to track this problem are not advanced - no oscillator, > etc... A logic probe is about all I have. > > Thank you, > Fowler > > -----Original Message----- > From: Rick C. [mailto:rixy@VISUALLINK.COM] > Sent: Sunday, March 10, 2002 10:34 PM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [PIC]: PIC crystal... > > > Maximum speed of the chip. > Rick > > Shirollah Ghadirian wrote: > > > Hi all, > > > > When it says on the chip 04 or 08 for the speed of the chip, is it the > > crystal value or 1/4 of the crystal value. > > > > Thanks in advance. > > > > -- > > http://www.piclist.com hint: The PICList is archived three different > > ways. See http://www.piclist.com/#archives for details. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.