Re: PIC (Microchip) assembler syntax query


bruce varley wrote:
> Hi, Maybe deserves an RTFM response, but I've just spent an hour on this
> with no success. I appear to be trying what the various advice notes
> suggest, but it isn't working.
>
> I'm declaring data memory space (starts at 0x20), up to now have been doing
> it clunkily as follows:
>
> REG1 EQU 0x20
> REG2 EQU 0x21
>
> But with other platforms one usually declares the locations themselves, as
> in:
>
> ORG 0x20
> REG1 DB 0
> REG2 DB 0
>
>

In your first example to are assigning memory addresses to reg1,reg2, I
expect thats what your trying to do. In the second example your
assigning a value to reg1,reg2, so if you havent given them an address
allready it will write to address 20, the last mem address you
specified, on each instruction.


> Attempting this with Microchip for 12C or 16F series results in a error
> message "Overwriting previous address contents (0020)".
> Would appreciate it if someone could tell me the correct syntax, and what
> that error message means. TIA

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