Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

--enable_external_bus

--enable_external_bus

This option will make the compiler add the special 

_ _require

 statement which will 

make XLINK include the code in 

cstartup.s90

 that enables the external data bus. Use 

this option if you intend to place RSTACK in external RAM.

Note: The code in 

cstartup.s90

 that enables the external data bus is preferably 

placed in low_level_inti instead.

To set the equivalent option in IAR Embedded Workbench, choose 
Project>Options>General Options>System.

--enhanced_core

--enhanced_core

Use this option to allow the compiler to generate instructions from the enhanced 
instruction set that is available in some AVR derivatives, for example ATmega161.

The enhanced instruction set consists of the following instructions:

MUL

MOVW

MULS

MULSU

FMUL

FMULS

FMULSU

LPM Rd,Z

LPM Rd,Z+

ELPM Rd,Z

ELPM Rd,Z+

SPM

This option corresponds to the Enhanced core option in the General Options category 
in IAR Embedded Workbench.

--error_limit

--error_limit=n 

Use the 

--error_limit

 option to specify the number of errors allowed before the 

compiler stops the compilation. By default, 100 errors are allowed. 

 must be a positive 

number; 

0

 indicates no limit.