I notice that Microchip do not have program memory write protection in
the PIC16F91x series (which is an attractive alternative to the F87x
series even if you don't need the LCD controller).

Does anyone know of a significant downside to this? As in possible
corruption of code flash under oddball EMI conditions?

The actual programming voltage is internally generated, according
to DS41244.  I wonder if the the internal voltage multiplier is shared with 
the EEPROM circuit.


Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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