SLAU132V User guide | 德州仪器 TI.com.cn

SLAU132V October 2004 – February 2020

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6.1.1 Code Memory Models

The MSP430 compiler supports two different code memory models, small and large, which are controlled by the --code_model option.

The small code model uses 16-bit function pointers and requires all code and all text sections to be placed in the low 64K of memory. This is the only valid code model for 16-bit MSP430 devices.
The large code model provides a 1 MB address space for code and uses 20-bit function pointers. It is the default for MSP430X devices, including the MSP430F5xxx and MSP430F6xxx families. Interrupt service routines must still be placed in the low 64 KB of memory (see Section 6.7.5).

The small code model is slightly more efficient in terms of run-time performance and memory usage when compared to the large code model. Therefore, it is beneficial to use the small code model when all code and text sections will fit in the low 64K of memory. Modules assembled/compiled using the small-code model are not compatible with modules that are assembled/compiled using large-code model. The linker generates an error if any attempt is made to combine object files that use different code memory models. An appropriate run-time library must be used as well.