> When we say that it is a PIC of 12,16,17 or 18 series, is it that we
> actually mean to differentiate it with the memory bit it can
> address at a time.

no

12-bit, 14-bit and 16-bit PIC cores refer to the number of bits in an
instruction. But to maximise confusion Microchip has decided to use the
designation PIC12 for both 12 and 14 bit cores when they are packaged in
an 8-pin dip, otherwise they are called PIC16.

> Is it
> possible that an application developed for PIC 12 could
> execute on PIC 16
> series.

Not without great care and at least re-assembly (or re-compilation).
Note that apart from the einstruction set the various PIC series also
differ greatly in banking and paging.

> And what exactly we mean when we say PIC can address
> 16 bit at a time?

Then we are talking nonsense.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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