Jacopo Monegato wrote 2011-09-27 19:46:
>
> I'v set all the ports as outputs. I think the problem is solved :) thank
> you all, but to undestand why this happens (aka why does only the pwm
> module is affected??) can i have some reference? i don't know exactly
> what to google :)

IF you are asking about the "open CMOS inputs", you can google
exactly that. :-) It will bring up pages like :

http://www.elektor.com/magazines/2007/march/open-cmos-inputs.81044.lynkx
http://www.piclist.com/tecHREF/logic/xtrapins.htm

The second link is good and actualy PIC related. :-)

If you are asking about why your PIC reacted in exactly the way you
described, I don't know.

Jan-Erik.




>
> Yes, i decided to disable MCLR because i think i'll use it, short of
> pins ;)
>
>> Date: Mon, 26 Sep 2011 22:45:44 +0200 From:
>> jan-erik.soderholm@telia.com To: piclist@mit.edu Subject: Re:
>> [PIC]PIC18F2550A, Pwm doesn't work when using on external power
>> supply
>>
>> Hi !
>>
>> Wherever the supply comes from, never have any "open CMOS inputs" ! If
>> PORTA are inputs, and are un-connected, that *might* produce the
>> effect you are seeing.
>>
>> How is MCLR handled. When conncted to the PICkit2, the PICkit2 manage
>> the MCLR pin, but how is it handled when connected to the "power
>> supply" ?
>>
>> Jan-Erik.
>>
>>
>>
>> Jacopo Monegato wrote 2011-09-26 22:33:
>>>
>>> Well, PORTA, but the program actually skips that part at the
>>> moment.... I think the crucial point is that the problem comes when
>>> i connect the PIC to the power supply instead of the PICkit
>>>
>>>> Date: Mon, 26 Sep 2011 22:22:10 +0200 From:
>>>> jan-erik.soderholm@telia.com To: piclist@mit.edu Subject: Re:
>>>> [PIC]PIC18F2550A, Pwm doesn't work when using on external power
>>>> supply
>>>>
>>>>
>>>>
>>>> Jacopo Monegato wrote 2011-09-26 18:57:
>>>>>
>>>>> but if i touch to some random and unconnected parts...
>>>>
>>>> Are those "unconnected parts", parts of the PIC ? This sounds as
>>>> a open-CMOS-input problem. Do you have any I/O pin that are
>>>> inputs (which is the default if you do not config them at all) and
>>>> not connected to anything ("open") ?
>>>>
>>>> Jan-Erik. -- http://www.piclist.com PIC/SX FAQ&   list archive
>>>> View/change your membership options at
>>>> http://mailman.mit.edu/mailman/listinfo/piclist
>>>
>> -- http://www.piclist.com PIC/SX FAQ&  list archive View/change your
>> membership options at http://mailman.mit.edu/mailman/listinfo/piclist
>
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