Thank you both.  I cleared BODEN in my program, but my programmer software
was overiding this.  I changed that and everything works great.  Thanks so
much.

Cheers,

Ian


> ianlesnet@cwazy.co.uk wrote:
>>The program works great at 5 volts, but I get nothing at 3.3volts.
>>Does anyone have experience working with PICs under 5 volts?  Is there
>>something obvious I have missed?
>
> Have you remembered to clear the Brown-Out Detect Enable bit (BODEN) in
> the configuration word (see section 14.1 of the data sheet)?  If it is
> set, then the BOD circuit holds the PIC in reset when running off 3.3V.
> In the PIC16F628, the BOD trips below a *fixed* threshold of around 4.0V.
>
> It caught me out first time around!
> --
> Ian Chapman
> Chapmip Technology, UK
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