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MC9S12XEP768 RAM Section from 0xFD1000 to 0x3FFF

Question asked by [hiper] on Jul 4, 2013
Latest reply on Jul 12, 2013 by [hiper]

Hi everyone!

 

I have an MC9S12XEP768 configured with ROMHM = 0 (Internal flash), so from FD1000 to 0xFD1FFF I have the 4k RAM page window and then the 8K non paged ram section from 0x2000 to 0x3FFF.

 

Could I configure the section in the prm file to fix somehow the RPAGE register and use that RAM as a fixed 12K of non paged ram and make it transparent to the application?

 

And some secondary questions:

 

Why in the datasheet says that the RAM page starts in 0x1000 when in 0x1000 logical there are registers?

Can I make a placement like this?

 

RAM_FD = READ_WRITE 0xFD1000 TO 0xFD1FFF

RAM_2000 = READ_WRITE 0x2000 TO 0x3FFF

 

And then ?

...

DEFAULT_RAM           

     INTO    RAM_2000, RAM_FD1800;

 

 

Thanks in advance.

 

Best regards,

 

[hiper]

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