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RAM expand on the HCS12

Question asked by Cong Guotao on Jul 16, 2006
Latest reply on Jul 17, 2006 by CrasyCat
we are busy with doing bus expened on HC12.we want to expened external 128k ram.we do simulator experimentation by codewarrior3.1.
   fristly, defining the external ram in simulator_linker.prm;
   secondly, distributing data variable to external ram in .c file;
   last,modifying option of compiler for HC12 tO -CpDPAGE=0x34 -Mb -PSegObj.
   now,runing program,we find external ram have been assigned by Start12.c.however,when runing main.c,do not modify value of data variable external ram.
   what is the reason that do not manipulate data variable in extenal ram.