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XTINY Compiler Directive

Abbreviation

XTY

Arguments

None.

Default

TINY

µVision

Options — C251 Compiler — Memory Model — Memory Model.

Description

This directive implements the XTINY memory model. The XTINY memory model places all function variables and local data segments in the near memory of the 251 system. This ensures efficient access to near data objects. The default data pointer size is 2 bytes and refers to near (NDATA / NCONST) space.

Regardless of memory model type, you may declare variables in any of the 251 memory areas. However, placing frequently used directives (such as loop counters and array indices) in data memory significantly improves system performance.

Note

  • The stack required for function calls is always placed in near memory, refered as memory class EDATA.
  • The XTINY memory model is typically the best choice for applications with medium data requirements.
Example
C251 SAMPLE.C XTINY

#pragma xtiny
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