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PIC (Microchip) assembler syntax query

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

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

Reply to
bruce varley
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"bruce varley" a écrit dans le message de news:

43df5824$ snipped-for-privacy@quokka.wn.com.au...

ORG 0x20 etc try to put your variables in program space, not in data space. You should use somelike like that :

dataarea UDATA H'020' reg1 RES 1 reg2 RES 1

programarea CODE etc

Friendly yours,

--
Robert Lacoste
ALCIOM - The mixed signal experts
www.alciom.com
Reply to
Robert Lacoste

I'm probably missing something but shouldn't that be

ORG 0x20 REG1 DB 1 REG2 DB 1

-Mike

Reply to
Mike Warren

doing

I use cblock

ie.

cblock 0x20 reg1 reg2 endc

If you do rtfm then it should make sense.

hth

Mike

Reply to
NewsGroup

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.

Reply to
cbarn24050

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