Specifications

CAVR-4

System startup and termination

AVR® IAR C/C++ Compiler

Reference Guide

System startup and termination

This section describes the runtime environment actions performs during startup and

termination of applications. The following figure gives a graphical overview of the

startup and exit sequences:

Figure 1: Startup and exit sequences

The code for handling startup and termination is located in the source files

cstartup.s90 and _exit.s90, and low_level_init.c located in the

avr\src\lib directory.

Reset

__low_level_init

Hardware setup

Static initialization

Dynamic C++ initialization

exit

abort

_Exit

__exit

Application

main

Program entry label

cstartup

Return from

main

and call

exit

System terminated

_exit

Dynamic C++ destruction

and

atexit

execution

_exit