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Sonsivri
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AVR QUESTION
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aamir
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AVR QUESTION
«
on:
August 13, 2008, 07:31:54 07:31 »
I am new to ATMEL AVR I am using ATMEGA8515 And PONYPROG IS USED TO PROGRAM AVR I am using LPT programmer ,Programmer is ok
I am using external crystal oscillator . Program is burned in AVR and verified also. Program is running on AVR i wonder as there is no clock
activity on pin 18 and 19 . If i removed crystal oscillator no program is running .As i have migrated from 8051 so It is strange problem for
me without no clock activity on pin 19 and 18 how program is running. I use fuse bits CKSEL3..0 bits all unchecked to select external
crystal oscillator. Please tell me what is problem.
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hate
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Re: AVR QUESTION
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Reply #1 on:
August 13, 2008, 02:12:42 14:12 »
Then I guess there is activity on the osc pins which you can't trace! Also according to the 'sut' bits there maybe a startup delay problem with the oscillator.
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microkid
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Re: AVR QUESTION
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Reply #2 on:
August 14, 2008, 04:03:38 04:03 »
Can you tell, how did you verified that the there is no activity.
You can only check it using an oscilloscope.
(If you try to check it with a multimeter, the clock activity may stop due to loading of meter)
MicroKid
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aamir
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Re: AVR QUESTION
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Reply #3 on:
August 14, 2008, 12:32:16 12:32 »
Iam using logic probet to see clock activity
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ppa88
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Re: AVR QUESTION
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Reply #4 on:
August 14, 2008, 01:44:01 13:44 »
I think logic probe will not indicate the clock activity properly and reliably. The best method is to use a CRO with high input impedance.
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