Hi Roland,
=20
I checked MPASM's help file and it says:
"The value assigned by the equ directive may not be reassigned later."
It also says you have to use the "set" directive when you want to do that=
, here's an example from the help file:
=20
perimeter set  0        ;The label 'perimeter' is

The value assigned by the set directive may be reassigned later.=20

lngth     equ  50H      ;The label 'lngth' is assigned the value 50H. wdt=
h      equ  25H      ;The label 'wdth' is assigned the value 25H.

=20

The value assigned by the equ directive may not be reassigned later.=20

perimeter set  2*(lngth+wdth)  ;Both 'perimeter' andarea      set  lngth*=
wdth      ;'area' values are reassigned.

So you can't use perimeter equ 5 or something and then use a=20

formula like the one above, since then you will change the constant,=20

which is impossible.

=20

(You can find this in the MPASM help file when you search for set,=20

there's also a link to it in the equ explanation.)

=20

Anthony



Roland <jemelectric@mweb.co.za> wrote:


> the code snippets;
>=20
> Org 0x20
> Cblock
> myCounter
> myCounter2
> endc
>=20
> and=20
>=20
> myCounter EQU 0x20
> mycounter2 EQU 0x21
>=20
> are exactly the same, perform the same function and there is no real re=
ason to use=20
> either. It's the location of the variable that is constant, not it's co=
ntents. The 'c' in=20
> cblock stands for 'constant' anyway.
>=20
> Sometimes specifying the location of a variable makes it easier to find=
 when looking > at the File registers in Mplab while debugging. But it's =
usually not necessary, and is > a mission, to define the exact location o=
f say 50, variables.
>=20
> Ultimately then, cblock is used for convenience when allocating lots of=
 variables.
>=20
> Regards
> Roland Jollivet


Website: http://members.lycos.nl/anthonyvh

	=09
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