Erik Klausen <PICLIST@MITVMA.MIT.EDU> wrote:

> > char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };  // fill an area with instructions
> >
> > main ()
> > {
> >        void (*f)() = x; // declare a function, starting at the variable x
> >        f();                  // execute it.
> > }
>
> Of course, a PIC programmer wouldn't think of this, since it is
> impossible to execute data on a PIC.

Erik:

You can't execute code from the PIC's Data MEMORY SPACE, but you can
certainly hand-code instructions as was done in the Pentium example
you quoted... For example, the following 16C54 program will toggle
pin RB0 continuously at a 50% duty cycle:

            PROCESSOR PIC16C54

            ORG 0

    X:      DATA    0x506, 0xA00+$+1, 0x406, 0xA00+X

    MAIN:   MOVLW   0xFE
            TRIS    6

            CALL    X

            ORG     0x1FF

            GOTO    MAIN

            END


-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499