Atmel CAVR-4 Manual De Usuario

CAVR-4

System startup and termination

Reference Guide

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:

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