Thanks for the tip Marcel.  Turns out it's not the PIC's fault - the 
values it is reading are actually changing (i.e. problem on the board 
somewhere else related to powerup, but not related to the PIC powerup) - 
sorry to bug the list for something I rushed to judgement on.

Thanks,

Tony


Marcel Duchamp wrote:
> On 3/4/2010 10:20 AM, Tony Vandiver wrote:
>   
>> I've got a PIC24FJ128GB110 part that's doing something a little wierd.
>> I had all the code working on the bench and was typically resetting via
>> either the ICD2 or the RealIce, and for part of its job, the board is
>> reading 4 a2d inputs.  I pulled the unit off the programmer and reset by
>> applying power (POR), and 2 of the 4 a2d inputs are reading about 1/3 of
>> what they did when reset via MCLR.  If I physically pull MCLR low while
>> powered up, everything works as expected again after the reset.  I'm
>> going to get to the bottom of it, but I wanted to start documenting this
>> and if this sounds familiar to anyone, please let me know.
>>
>> Thanks,
>>
>> Tony
>>
>>     
> Check your Vcc risetime; if it's too slow, the chip may not get a good 
> reset.
>   
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