Specifications

CAVR-4
214
Descriptions of extended keywords
AVR® IAR C/C++ Compiler
Reference Guide
__version_1
The __version_1 keyword is available for backward compatibility. It makes a
function use the calling convention of the A90 IAR C Compiler instead of the default
calling convention, both which are described in Calling convention, page 99.
This calling convention is preferred when calling assembler functions from C.S