> There is no way to tell, as far as I can see, if a particular
> PIC has "Self-Programming" apart from reading the data sheet
> or (sometimes) reading the device specific web page.

In the PIC18 family, any PIC that has internal EEPROM is
self-programmable.  Any PIC that does not have internal EEPROM is not
self-programmable.

--
John W. Temples, III
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