Configuring MC9S12C64 Flash

[pirate]

The Microcontroller is MC9S12C64.

I am trying to program the MC9S12C64  flash but sometimes i get fixup overflow interrupt linker errors. I think the reason for that is the division of flash into blocks...addresses 0x4000 to 0x7FFF and 0xC000 to 0xFFFF are unpaged flash.... 0x8000 to 0xBfff is paged flash i want to use this whole range from 0x4000 to 0xFFFF as contiguous memory ..

how can i do it?

attached is the prm file...

[kef]

Not CW guru, but I think that first of all you should make sure you are using small memory model, -Ms compiler switch, also small memory model libraries.

Then you should simply define single ROM segment

      ROM           = READ_ONLY     0x4000 TO   0xFEFF;

and change placement from 

      DEFAULT_ROM, NON_BANKED,             /* runtime routines which must not be banked */
      COPY                    /* copy down information: how to initialize variables */
                              /* in case you want to use ROM_4000 here as well, make sure
                                 that all files (incl. library files) are compiled with the
                                 option: -OnB=b */
                        INTO  ROM_C000/*, ROM_4000*/;

      OTHER_ROM         INTO  PAGE_3C, PAGE_3D                  ;
 

to

       DEFAULT_ROM, NON_BANKED, 
      COPY, OTHER_ROM    

                                              INTO  ROM;

[pirate]

I tried the method you suggested Jim but it still doesnot work. I am working with the linker settings in the project.........if you come to think of anything please let me know...

Thanks!!

[JimDon]

I belive I have tried this and I think this works.
Just make sure PPAGE never gets changed.

Code:

SEGMENTS      ROM_8000      = READ_ONLY     0x8000 TO   0xBFFF;PLACEMENT  INTO  ROM_4000, ROM_8000, ROM_C000;