Andre Abelian <engelec@earthlink.net> wrote:

> 1. What is the reason when I  label name error Mplab doesn't like it
> displays symbol previously not defined. when I change  it to
> something else works ok. How can find out what to lable.is there any
> specific names that shouldn't use?

    Andre:

    MPASM doesn't let you use "ERROR" as a label name because there's
    an assembler directive called "ERROR"... For the same reason, you
    can't use "EQU", "ORG", "MACRO", or any of the other directives
    as label names.

> 2. the way I understood about cblock is it is automatic equation
> that compiler will find empty location and use it. let say I am
> using simple table code when I use cblock it doesn't work when I use
> manual way  like xxxx equ     xxx works ok. Could you tell me when
> should I use Cblock instraction. the way I use it
>
>         cblock  0x00
>         test
>         endc

    CBLOCK doesn't automatically find empty locations; it just
    assigns sequential values to a list of symbols.  To use it
    properly, you must specify a valid starting address... For
    example:

        CBLOCK 0x20
        TEST1
        TEST2
        ENDC

    The above fragment will assign TEST1 to 0x20 and TEST2 to 0x21;
    it's equivalent to:

        TEST1   EQU     0x20
        TEST2   EQU     0x21

    -Andy

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