At what voltage were you running it? :)


At 11.09 2005.05.17 -0400, you wrote:
>Hmmm... I have a prototype 18F6585 based device on my desk. Just for grins I
>tried changing the 10MHz xtal to 16MHz (Bumps clock from 40MHz to 64MHz) -
>it didn't work for me :-(  If I can find an 11MHz xtal lying around I'll try
>it at 44MHz.
>
>-- Mark
>
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
>> Of Jinx
>> Sent: Tuesday, May 17, 2005 9:27 AM
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [PIC]: PIC18F at 44.5MHz. Anybody has experiences to share?
>>
>>
>> > > Does anybody have experiences to share about overclocking
>> > > 40MHz-rated PIC18F parts to about 44.5MHz?
>>
>> Some time last year I posted about an 18F452 that I accidentally
>> connected an 18.432MHz xtal to and then turned the PLL on. It
>> did appear to run OK with some very simple timing tests at
>> 73.728MHz but I would never expect to try that in production
>> nd without a complete battery of tests on all the modules it's
>> impossible to say whether it was a fully functional device at that
>> speed
>>
>> Although you've been advised that 44.5MHz is out of spec, that
>> doesn't necessarily mean it won't work reliably. Just that if it
>> doesn't you've no one to blame but yourself. I don't know what
>> Microchip's actual criteria are for specifications at the higher
>> frequencies, but at the bottom end you probably can overclock
>> parts. For example, a -04 part is guaranteed to run at 4MHz,
>> but came from the same batch as -10 parts, and failed the 10MHz
>> test. So it could run alright at 6MHz or 8MHz
>>
>> It might very well be the case that some 40MHz parts will run
>> at 44.5MHz. You would have to sort out which ones will, and
>> with the functions you're using
>>
>>
>> --
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>>
>>
>
>
>
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