>> In the context of this thread you don't need to slow the
>> PIC output rise time. RTFM PIC32MX and M25P16V.
>>
>
> No, you need to slow the *line* rise time, I don't know if
> the PIC32 has slew-rate control.

I would agree, but the problem is with M25P16V. Its SPI clock slew
rate is not allowed to be less than 0.1 V/nsec according to its
datasheet.

PIC32 output slew rate can be as low as 0.3 V/nsec. That's pretty
close to 0.1 V/nsec already and you may expect that the line would
slow the edge further. Yes, it is not good to apply that fast changing
signal to long line, but you just have no other option - M25P16V can't
work with slow edges of SPI clock signal.

"to meet EMI and RFI emission standards" - perhaps good ground plane,
or other tricks could do the job.
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