A lot of messages are dealing with OUTPUT expansion questions.

Has someone put N (N >= 2) PIC16C84 TOGETHER ?

I mean, when the application allows and there are only a few fixed
_input_ ports needed (fitting the limitations of each single one PIC),

the N PICs could work

        almost synchronously together (each one its own program)

to generate output signals,

        each one working essentially the SAME program,

        but generating different parts of the
        output "word"


When the application allows, the PIC's "could" even run seperately - on
their individual clocks. The K outbits would have some jitter, but
limited jitter.

But of course, it would be clever, to let one PIC (here: PIC-1) master
the others, to avoid an external clock generator, if possible.


             !!==> PIC-1 ===> outputs bits 1..i =========>
             !!      !
             !!      v clock                               together
             !!      !
==INPUTS===>=+===> PIC-2 ===> output bits (i+1) .. j ====> we now
             !!      !
             !!      v                                     have
            ....   ...
             !!      !                                     K output bits
             !!==> PIC-N ===> output bits (..) .. K =====>


Has someone any experience with tying clocks together ?

For some (limited) applications, not for all, the use of N PICs would be
cheaper than to invest in latches, shift-registers and multiplexers.

I would really be interested in some circuit designs showing the
feasibility !

Wherever you are, have a nice day !

Tom


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Thomas Gries                          written 14/02/97 04:42:46 MET
The Hague/The Netherlands
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