Atmel CAVR-4 Manual De Usuario

CAVR-4

Descriptions of implementation-defined behavior

Reference Guide

The function called at program startup is called 

main

. There is no prototype declared for 

main

, and the only definition supported for 

main

 is:

int main(void)

To change this behavior for the IAR CLIB runtime environment, see Implementation of 
cstartup, page 90. To change this behavior for the IAR DLIB runtime environment, see 
Implementation of system startup code, page 81.

The streams 

stdin

 and 

stdout

 are treated as interactive devices.

The number of significant initial characters in an identifier without external linkage is 
200.

The number of significant initial characters in an identifier with external linkage is 200.

Identifiers with external linkage are treated as case-sensitive.

The source character set is the set of legal characters that can appear in source files. The 
default source character set is the standard ASCII character set. However, if you use the 
command line option 

--enable_multibytes

, the source character set will be the host 

computer’s default character set.

The execution character set is the set of legal characters that can appear in the execution 
environment. The default execution character set is the standard ASCII character set. 
However, if you use the command line option 

--enable_multibytes

, the execution 

character set will be the host computer’s default character set. The IAR DLIB Library 
needs a multibyte character scanner to support a multibyte execution character set. The 
IAR CLIB Library does not support multibyte characters.