9.4.1 Options

-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, 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, at90s2333, at90s2343, attiny22, attiny26, at90s4414, at90s4433, at90s4434, at90s8515, at90c8534, at90s8535).

Instruction set avr25 is for the classic AVR core with up to 8K program memory space plus the MOVW instruction (MCU types: attiny13, attiny13a, attiny2313, attiny24, attiny44, attiny84, attiny25, attiny45, attiny85, attiny261, attiny461, attiny861, attiny43u, attiny48, attiny88, at86rf401).

Instruction set avr3 is for the classic AVR core with up to 128K program memory space (MCU types: at43usb355, at76c711).

Instruction set avr31 is for the classic AVR core with exactly 128K program memory space (MCU types: atmega103, at43usb320).

Instruction set avr35 is for classic AVR core plus MOVW, CALL, and JMP instructions (MCU types: attiny167, at90usb82, at90usb162).

Instruction set avr4 is for the enhanced AVR core with up to 8K program memory space (MCU types: atmega48, atmega48p,atmega8, atmega88, atmega88p, atmega8515, atmega8535, atmega8hva, at90pwm1, at90pwm2, at90pwm2b, at90pwm3, at90pwm3b).

Instruction set avr5 is for the enhanced AVR core with up to 128K program memory space (MCU types: atmega16, atmega161, atmega162, atmega163, atmega164p, atmega165, atmega165p, atmega168, atmega168p, atmega169, atmega169p, atmega32, atmega323, atmega324p, atmega325, atmega325p, atmega3250, atmega3250p, atmega328p, atmega329, atmega329p, atmega3290, atmega3290p, atmega406, atmega64, atmega640, atmega644, atmega644p, atmega645, atmega6450, atmega649, atmega6490, atmega16hva, at90can32, at90can64, at90pwm216, at90pwm316, atmega16u4, atmega32c1, atmega32m1, atmega32u4, atmega32u6, at90usb646, at90usb647, at94k).

Instruction set avr51 is for the enhanced AVR core with exactly 128K program memory space (MCU types: atmega128, atmega1280, atmega1281, atmega1284p, at90can128, at90usb1286, at90usb1287).

Instruction set avr6 is for the enhanced AVR core with a 3-byte PC (MCU types: atmega2560, atmega2561).

Instruction set avrxmega4 is for the XMEGA AVR cor with up to 64K program memory space and less than 64K data space (MCU types: atxmega64a3).

Instruction set avrxmega5 is for the XMEGA AVR core with up to 64K program memory space and greater than 64K data space (MCU types: atxmega64a1).

Instruction set avrxmega6 is for the XMEGA AVR core with up to 256K program memory space and less than 64K data space (MCU types: atxmega128a3, atxmega256a3, atxmega256a3b).

Instruction set avrxmega7 is for the XMEGA AVR core with up to 256K program memory space and greater than 64K data space (MCU types: atxmega128a1).

-mall-opcodes

Accept all AVR opcodes, even if not supported by -mmcu.

-mno-skip-bug

This option disable warnings for skipping two-word instructions.

-mno-wrap

This option reject rjmp/rcall instructions with 8K wrap-around.