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(gcc-300.info)AVR Options

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AVR Options
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   These options are defined for AVR implementations:

`-mmcu=MCU'
     Specify ATMEL AVR instruction set or MCU type.

     Instruction set avr1 is for the minimal AVR core, not supported by
     the C compiler, only for assembler programs (MCU types: at90s1200,
     attiny10, attiny11, attiny12, attiny15, attiny28).

     Instruction set avr2 (default) is for the classic AVR core with up
     to 8K program memory space (MCU types: at90s2313, at90s2323,
     attiny22, at90s2333, at90s2343, at90s4414, at90s4433, at90s4434,
     at90s8515, at90c8534, at90s8535).

     Instruction set avr3 is for the classic AVR core with up to 128K
     program memory space (MCU types: atmega103, atmega603).

     Instruction set avr4 is for the enhanced AVR core with up to 8K
     program memory space (MCU types: atmega83, atmega85).

     Instruction set avr5 is for the enhanced AVR core with up to 128K
     program memory space (MCU types: atmega161, atmega163, atmega32,
     at94k).

`-msize'
     Output instruction sizes to the asm file.

`-minit-stack=N'
     Specify the initial stack address, which may be a symbol or
     numeric value, `__stack' is the default.

`-mno-interrupts'
     Generated code is not compatible with hardware interrupts.  Code
     size will be smaller.

`-mcall-prologues'
     Functions prologues/epilogues expanded as call to appropriate
     subroutines.  Code size will be smaller.

`-mno-tablejump'
     Do not generate tablejump insns which sometimes increase code size.

`-mtiny-stack'
     Change only the low 8 bits of the stack pointer.