Thanks for that one Borut. I just knew there was something 14-bit wide in 12(C/F)/16F devices which is 16-bit in 18F chips :) so the '8-bit'-ness of the chip is actually the width of the busses inside the real processor?

Luit


On 3/31/07, Borut Razem <borut.razem@siol.net> wrote:
Luit van Drongelen wrote:
> If I recall correctly, the 18Fxxx(x) chips are 16-bit chips, hence
> PIC16 architecture
> the 16Fxx(x) chips are 14 bit, supported by the PIC architecture port
>
Actually 18F* has 16-bit wide instructions while 16F* has 14-bit wide
instructions.

I think that there is no precise definition of what 8, 16, ... bit CPU
means: the address space, the widest chunk of date memory which can be
accessed with one instruction, the width of accumulators, ... I would
say that both 16F* and 18F* families are 8 bit, which is also
Microchip's statement.


Borut

> Anyone who knows better, please correct me if I'm wrong.
>
> Greetz,
> Luit
>
> On 3/31/07, *Marc Roessler* < marc@tentacle.franken.de
> <mailto:marc@tentacle.franken.de>> wrote:
>
>     Hi,
>
>     i am slightly confused... http://sdcc.sourceforge.net/doc/
>     sdccman.html/node113.html reads:
>             The PIC16 port is the portion of SDCC that is responsible
>     to produce
>     code for the
>             Microchip(TM) microcontrollers with 16 bit core. Currently
>     this
>     family of microcontrollers
>             contains the PIC18Fxxx and PIC18Fxxxx. Currently supported
>     devices
>     are: ...
>
>     Does this mean that PIC16Fxxx in general is supported, plus the ones
>     listed below as PIC18Fxxx(x)?
>     Or does the "PIC16" only refer to the PIC18 series (makes no
>     sense?)...
>     Also i am a bit confused because the PIC18F6520 (for example) is not
>     a 16 bit processor. In fact, none of
>     the PIC16F.. and PIC18F.. series seems to be... (according to the
>     Microchip page, only the 24F, 24H and
>     dsPIC30 and dsPIC33 series are 16 bit processors).
>
>     I'd be happy about a bit of clarification :)
>
>     Greetings,
>       Marc
>


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