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Richard Erlacher
01/26/10 21:25
Read: 141 times
Denver, Co
USA


 		 #172749 - so ... Erik ... what's your point?
Responding to: Erik Malund's previous message
Erik Malund said:
The ATMEL pirece oscillators work as well as anyone's, but those don't work well at the 3rd harmonic.

Few of them work well at frequencies much above 20 MHz and, AFAIK, none at all at 3rd overtone.

as Kai (an Atmel fan, if I recall) stated some of the (newer?) Atmel chips do not work well at higher frequencies even with a fundamental crystal

There is (as far as I know) no '51 derivative, Atmel or not, that oscillates at the overtone with an overtone crystal.

... and that's exactly why one might want to try a crystal oscillator.

Anyhow, in these EMI concerned days I much prefer to work with a PLL equipped derivative if a higher frequency is required.

Erik

PS as seen in http://www.8052.com/forum/read/172729 I am definitely not trying to start a food fight.


I doubt that EMI is a large concern for the O/P who's simply experimenting with his first 805x. A crystal oscillator will verify the oscillator/performance ratio that he was trying to verify. A crystal oscillator will always work, irrespective of who manufactured the MCU. As Kai has pointed out in past writings, the crystal oscillator circuit built into the MCU doesn't always behave as expected, particularly when the capacitors aren't properly sized.

Further, I seriously doubt that the O/P is at all interested, at least at this stage, in what preferences you might have. He's clearly stated what he wanted to do, and you, Erik, haven't suggested anything that might help.

RE





List of 26 messages in thread
TopicAuthorDate
execution speed and crystal frequency      Hans Marée      01/25/10 10:29      
   my guess is ...      Erik Malund      01/25/10 11:26      
   overtone      Stefan KAnev      01/25/10 11:27      
   As others already mentioned...      Kai Klaas      01/25/10 13:16      
      Indeed overtone      Hans Marée      01/26/10 13:48      
         Just try the crystal with 15pF + 15pF caps.      David Prentice      01/26/10 14:26      
   Try it with a crystal oscillator, rather than a crystal      Richard Erlacher      01/25/10 16:42      
      baloney      Erik Malund      01/25/10 16:51      
         Baloney #2      Andy Neil      01/25/10 18:02      
         Where is your head wedged, Erik?      Richard Erlacher      01/25/10 18:38      
            just correcting invalid info      Erik Malund      01/25/10 19:00      
               SO ... What, exactly, is incorrect?      Richard Erlacher      01/25/10 23:35      
                  already stated      Erik Malund      01/26/10 07:33      
                     You are showing us how smart you are again, Erik!      Richard Erlacher      01/26/10 09:28      
                        not my intention, but thanks for the compliment      Erik Malund      01/26/10 09:46      
         Richard is right...      Kai Klaas      01/26/10 10:12      
            I do not use these and ....      Erik Malund      01/26/10 10:19      
               Fact is ...      Richard Erlacher      01/26/10 18:49      
                  as Kai stated      Erik Malund      01/26/10 19:19      
                     so ... Erik ... what's your point?      Richard Erlacher      01/26/10 21:25      
                        I did      Erik Malund      01/27/10 05:32      
                           Once again, Erik, you've missed the point      Richard Erlacher      01/27/10 09:58      
                              YOU would sell a suicide candidate a rope      Erik Malund      01/27/10 11:15      
                                 come on...      Stefan KAnev      01/27/10 12:08      
                     come on...      Stefan KAnev      01/27/10 12:07      
   Specifying Quartz Crystals      Enrique Viseras-Marin      01/26/10 06:35      

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