Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 1. Using the compiler

The table below shows the predefined runtime model attributes that are available for the 
AVR IAR C/C++ Compiler. These can be included in assembler code or in mixed C or 
C++ and assembler code.

The easiest way to find the proper settings of the 

RTMODEL

 directive is to compile a C or 

C++ module to generate an assembler file, and then examine the file.

If you are using assembler routines in the C or C++ code, refer to the chapter Assembler 
directives in the AVR® IAR Assembler Reference Guide.

_ _rt_version

2.30

This runtime key is always present in all 

modules generated by the AVR IAR C/C++ 

Compiler. If a major change in the runtime 

characteristics occurs, the value of this key 

changes.

_ _cpu

0–6

Corresponds to the -v option used.

_ _cpu_name

Corresponds to the processor derivative 

name, as it appears in Table 2, Mapping of 

processor options, page 6, for example 

AT90S2343

 or ATmega8515. Note that 

for the FpSLic derivative, the value is 

AT94Kxx

.

_ _double_size

32

 or 64

States the size of double. The default size is 

32. Use the compiler option 

--64bit_doubles

 to override the 

default.

_ _enhanced_core

Enabled

Available only if the compiler option 

--enhanced_core

 or --cpu for a target 

processor with enhanced core is used.

_ _memory_model

1–3

Corresponds to the used memory model, 

where the value can be 1, 2, or 3 for Tiny, 

Small, or Large, respectively.

_ _no_rampd

Enabled or disabled

Defined for targets with >64 Kbytes of data 

memory. Disabled if the target processor has 

a RAMPD register, otherwise enabled.