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Access RAM Memory

 
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Fusillade



Joined: 02 Aug 2007
Posts: 31

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Access RAM Memory
PostPosted: Thu Jan 31, 2008 9:17 am     Reply with quote
Compiler Version: 4.047
IDE Version: MPLAB IDE V7.60
Device: PIC18F2520

Does the compiler determine how much of the Access RAM Area (0x00 - 0x7F) is reserved as a scratchpad for data manipulation?

If so, how do I know how much has been reserved so I can make sure the memory is saved during my #int_global routine? Or should I continue to compile the program and view the assembly code to determine what memory area is being used?

Thanks.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jan 31, 2008 12:29 pm     Reply with quote
Here are some posts by Ttelmah in which he discusses the scratch
variables:
http://www.ccsinfo.com/forum/viewtopic.php?t=27996
http://www.ccsinfo.com/forum/viewtopic.php?t=27348
http://www.ccsinfo.com/forum/viewtopic.php?t=31785
http://www.ccsinfo.com/forum/viewtopic.php?t=28629
Fusillade



Joined: 02 Aug 2007
Posts: 31

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PostPosted: Thu Jan 31, 2008 2:23 pm     Reply with quote
PCM programmer wrote:
Here are some posts by Ttelmah in which he discusses the scratch
variables:
http://www.ccsinfo.com/forum/viewtopic.php?t=27996
http://www.ccsinfo.com/forum/viewtopic.php?t=27348
http://www.ccsinfo.com/forum/viewtopic.php?t=31785
http://www.ccsinfo.com/forum/viewtopic.php?t=28629


So as Ttelmah wrote:

Quote:
There are two distinctly different types of scratch variable used by CCS. The first are the true 'system' scratch variables. These are located at the bottom of memory, and are global/static in nature. The location for these, can be defined from the device editor, under the 'memory' tab, and they will be located at the defined point, and grow upwards, normally occupying just five locations.


As a result, I should just concern myself with protecting the first 5 "true system" bytes of scratch memory during my interrupt routine as the other scratch variables are likely not affected.
_________________
New:

Compiler Version: 5.078
IDE Version: MPLAB X V4.15
Devices: PIC18LF****

Old:

Compiler Version: 4.121
IDE Version: MPLAB IDE V8.63
Devices: PIC18LF****
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