John Wrote...

> Dear PICsters,
> I have a question for someone who can tell me about macros. How many times
> can a macro be called. Can a macro be called from inside another macro? What
> is the difference between a macro and a subroutine? If I happen to call a
> macro from outside the page limits, what will happen?
>
>
>                                                 Please advise
>
> Regards John

A Macro is not a PIC command. Its a label for people
writing code.
In the assembler the Macro is some lines of PIC
commands that are given a single name to REPRESENT
those lines.
When the .asm file is assembled those Macro words are
substituted for the lines you originally wrote.
The advantage of this is that you dont have to keep
writing the same few lines over and over again and it can
make more sense to have a descriptive name like
GET_A2D.
A subroutine is different in that the name(label) of the
subroutine is a pointer to the address of where the first
byte of the subroutine is stored in the program memory.


_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

www.psych.auckland.ac.nz

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