Segmentation

The linker memory space may be partitioned into several segments. The compiler allows associating certain global variables or functions with a peculiar segment. Those variables/functions will then be allocated by the linker into that segment. Where the segment actually lies is determined by a placement entry in the linker parameter file.

There are three types of segments, code segments, data segments and constant data segments, each with a matching pragma:

• #pragma CODE_SEG
• #pragma DATA_SEG
• #pragma CONST_SEG

Each such pragma is valid until the next pragma of the same type is encountered. If no pragma is specified, the compiler assumes the following default segments:

• DEFAULT_ROM, for code
• DEFAULT_RAM, for data
• ROM_VAR, for constant data

To explicitly set the current segment to the default segment, use segment name DEFAULT:

• #pragma CODE_SEG DEFAULT
• #pragma DATA_SEG DEFAULT
• #pragma CONST_SEG DEFAULT

For more information, refer to the following topics:

• CODE_SEG
• DATA_SEG
• CONST_SEG