> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Jesse Lackey
> Sent: 04 June 2009 07:37
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] PIC18F6410 start-up problems...
> 
> Just to clarify the test setup, since there is confusion:
> 
> The original test board has a 220uF electrolytic bulk cap, and no less
> than 5 0.1uF ceramic caps, one for each VDD and one for the analog
VDD.
>   (There is a small amount of non-PIC circuitry as well.)
> 
> The PIC will not run with brownout enabled and set to 4.6V when using
a
> clean, double-checked-output-voltage with scope and DMM bench supply I
> have used every day for 5 years.

Did you actually check the datasheet?  The "nominal" 4.6v brownout level
could be as high as 4.87v in practice. That gives you just 130mv head
room from your 5v nominal supply...

Sounds like you simply selected an inappropriate brownout voltage,
possibly coupled with small voltage transients on you design.

Regards

Mike

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