Specifications

CAVR-4

AVR® IAR C/C++ Compiler

Reference Guide

Data storage ...................................................................................................... 15

Introduction .............................................................................................. 15

Storing data ........................................................................................ 15

Extended keywords for data ............................................................... 16

Memory models ...................................................................................... 17

Specifying a memory model .............................................................. 17

Memory types and memory attributes ......................................... 18

Using data memory attributes ............................................................ 19

Pointers and memory types ................................................................ 20

Structures and memory types ............................................................ 21

More examples ................................................................................... 21

C++ and memory types ...................................................................... 22

The stack and auto variables ............................................................. 23

Dynamic memory on the heap ........................................................ 25

Functions ............................................................................................................. 27

Controlling functions ............................................................................ 27

Extended keywords for functions ...................................................... 27

Function storage ..................................................................................... 28

Special function types .......................................................................... 29

Interrupt functions ............................................................................. 29

Monitor functions ............................................................................... 30

C++ and special function types ......................................................... 32

Function directives ............................................................................. 32

Placing code and data .................................................................................... 33

Segments and memory ........................................................................ 33

What is a segment? ............................................................................ 33

Placing segments in memory ............................................................ 34

Customizing the linker command file ................................................ 35

Data segments ......................................................................................... 37

Static memory segments ................................................................... 37

Segments for static data in the linker command file .......................... 41

The data stack .................................................................................... 41