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C COMPILER->8051 Specific Features->Default Memory Space Usage

Unless a memory space qualifier is used, the Crossware 8051 ANSI C compiler will place objects in the following locations:
    

• if an object is declared as _bit it is placed in bit-addressable data memory unless it is an automatic variable in a reentrant function when it is quietly converted to an unsigned char
  
• string literals are placed in program memory
      

• if an object is declared as const it is placed in program memory
      

• if the small or tiny memory model is the default memory model the object is placed in internal indirectly addressable data memory
  
• if the large memory model is the default memory model, the object is placed in external data memory