The compiler provides different mechanisms for controlling placement of functions and data objects in memory. To use memory efficiently, you should be familiar with these mechanisms and know which one is best suited for different situations. You can use:

• Data models

  By selecting a data model, you can control the default memory placement of variables and constants. For more information, see Data models.

• Data memory attributes

  Using IAR-specific keywords or pragma directives, you can override the default placement of variables and constants. For more information, see Using data memory attributes.

• The @ operator and the #pragma location directive for absolute placement.

  Using the @ operator or the #pragma location directive, you can place individual global and static variables at absolute addresses. For more information, see Data placement at an absolute location.

• The @ operator and the #pragma location directive for section placement.

  Using the @ operator or the #pragma location directive, you can place individual functions, variables, and constants in named sections. The placement of these sections can then be controlled by linker directives. For more information, see Data and function placement in sections.