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???
04/27/10 21:38
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#175467 - That wasn't the question
Responding to: ???'s previous message
Per Westermark said:
If the processor has a register that you don't need to use, then you can use it as a variable.

But remember that SFRs are not just memory - they directly affect hardware.
And not all registers will read-back the same value that you just wrote...

But I don't think that was the question:
Kaustav Dey Biswas said:
... fit in some program variables in the un-utilized spaces of the SFR memory region (0x80 - 0xFF)?

I think he's talking about locations in SFR space that are not documented as being used at all.

It would be an extremely bad idea to mess with them!!

Of course, you should look for a different processor unless you are critically desperate.

Absolutely

As soon as you start with ugly workarounds it can only go downhills.

Indeed.


List of 6 messages in thread
TopicAuthorDate
Utilizing the SFR memory space for storing variables            01/01/70 00:00      
   Variables at absolute addresses            01/01/70 00:00      
      That wasn't the question            01/01/70 00:00      
         Definitely desperate measures            01/01/70 00:00      
   Not to be relied upon            01/01/70 00:00      
      Extending "efficient as possible"...            01/01/70 00:00      

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