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variable allocated in paged RAM & its unprecented behaviour

Question asked by ruby krishna on Nov 4, 2015
Latest reply on Nov 6, 2015 by Radek Sestak

Hi All,

 

We are using  MC9S12XHY controller.  Controller permits 8K  non paged ram and 4k  paged ram. Since  ouyrram consumption is more than 8K,  we used paged ram.

We referred the following documents for proper implementation

TN238.pdf TN240.PDF( From freescale)

 

#pragma DATA_SEG __GPAGE_SEG PAGED_RAM

static unsigned int a=23;

static unsigned int b=35;

#pragma DATA_SEG DEFAULT

 

We verified from the .map file and variables are allocated in the Paged RAM  segment.

we also faced problem while copying values between two paged ram variables

 

While using this variables in runtime, we observed unprecedented behavior in these RAM variables.  To sum it up, if we allocate these variables  in non paged ram, we didnt face any issue.

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