John Payson wrote:
>
> >>Actually,
> >>take care of layout, decoupling, external drivers, anything...
>
> >BING BING BING  You win a cigar :)
>
> >Yes, there are no EMI answers like "low EMI microcontrollers" or "FCC
> >approved microcontrollers".
> >You have to lay the board out right. You can make the noisiest chip near
> >silent, and you can make the quietest chip flunk horribly.
>
> I received e-mail once from an engineer at HP who designed a 40MHz microproces
sor board for one of HP's printers; the thing was a double-sided (not 4-layer) b
o
>
> Generally, I suspect that PIC's (especially the internal-clock ones) are going
 to be fairly EMI-quiet if you do a good job of bypassing the VDD rail at the ch
i
>
> In fact, I'd say that PIC's by design take a major step toward EMI reduction v
s older microprocessors in that they generally don't have any off-chip memory bu
s
>
> The only other point that I'd mention would be that if you're driving shift re
gisters, etc., especially if the signals are traveling any significant distance,

Thanks for this information!

Miguel.