Specifications

CAVR-4

Basic settings for project configuration

AVR® IAR C/C++ Compiler

Reference Guide

Both options set up default behavior—implicit assumptions—but note that the

--cpu

option is more precise because it contains more information about the intended target

than the more generic

-v option. The --cpu option knows, for example, how much flash

memory is available in the given target and allows the compiler to optimize accesses to

code memory in a way that the

-v option does not. See Mapping of processor options

--cpu and -v, page 6.

The

--cpu=derivative option implicitly sets up all internal compiler settings needed

to generate code for the processor variant you are using. The following options are

implicitly controlled when you use the

--cpu option: --eecr_address,

--eeprom_size, --enhanced_core, --spmcr_address, -v and --64k_flash.

Because these options are automatically set when you use the

--cpu option, you cannot

set them explicitly. For information about implicit assumptions when using the -v

option, see Summary of processor configuration, page 8. To read more about the

generated code, see -v, page 197.

See the AVR® IAR Embedded Workbench™ IDE User Guide for information about

setting project options in IAR Embedded Workbench.

Use the --cpu or -v option to specify the AVR derivative; see the chapter Compiler

options for syntax information.

Mapping of processor options --cpu and -v

The following table shows the mapping of processor options and which AVR

microcontrollers they support:

Processor variant Generic processor option Supported AVR derivative

--cpu=1200 -v0 AT90S1200

--cpu=2313 -v0 AT90S2313

--cpu=2323 -v0 AT90S2323

--cpu=2333 -v0 AT90S2333

--cpu=2343 -v0 AT90S2343

--cpu=4414 -v1 AT90S4414

--cpu=4433 -v0 AT90S4433

--cpu=4434 -v1 AT90S4434

--cpu=8515 -v1 AT90S8515

--cpu=8534 -v1 AT90S8534

--cpu=8535 -v1 AT90S8535

Table 2: Mapping of processor options