Strictly speaking all you are doing is assigning the label "TEMPW" to the
number 0x020 (32) (and so on).  What you use them for (memory address,
location in register space, number of coffee beans in a decagram or
whatever) is totally up to you.  The assembler couldn't care less as long as
it is within the range required for the destination.

This is a *really* subtle point and one that is important to remember
because I continually see new PICmicro programmers get messed up on it.  The
reason why it is confusing is that most new programmers assume the assembler
is a lot smarter than what it is.

I'm being pedantic because of your follow up question ("I forgot to ask, is
it assumed to 1 byte in memory, or is this something for each processor?").
The only thing assumed is that each label is assigned to a constant.


The four labels below could be declared using:

 CBLOCK 0x020
TEMPW
TEMPS
REGA
REGB
 ENDC

or

 ORG 0x020
TEMPW
 ORG 0x021
TEMPS
 ORG 0x022
REGA
 ORG 0x023
REGB

or using the equate symbols that you have specified below.  In any of the
cases, you can use the labels as constants, register addresses or program
memory addresses.


To keep the usage of the labels for different purpose separate, I use the
four conventions:

1.  For variable registers, I use the CBLOCK directive.  Note that with the
CBLOCK statement, you have the option of specifying how many the counter is
incremented by (the default is one) before the next label's value is
assigned.
2.  For program memory address, I define the labels in the source code as I
show above.
3.  For numeric constants, I use the "EQU" directive as you have done.
4.  For variables within conditionally assembled code, I use the "define"
directive.  This allows a great deal of flexibility in programming, but it
is often not for the faint of heart.

myke
----- Original Message -----
From: "rad0" <rden25@MINDSPRING.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, April 15, 2001 9:12 PM
Subject: [pic]: beginning assembly question


> what are these equate statements doing?
>
> Is this assigning the var labels to positions in memory or
> setting aside memory space, or what?
>
> thanks in advance
>
>
> ; VARIABLE DECLARATION
>
> TEMPW             EQU      0x20
>
> TEMPS              EQU      0x21
>
> REGA                EQU      TEMPS + 1
>
> REGB                EQU      REGA + 1
>
> --
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>

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