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<h4 class="subsection">9.5.1 Options</h4>
<p><a name="index-AVR-options-_0028none_0029-783"></a><a name="index-options-for-AVR-_0028none_0029-784"></a>
<a name="index-g_t_0040code_007b_002dmmcu_003d_007d-command-line-option_002c-AVR-785"></a>
<dl><dt><code>-mmcu=</code><var>mcu</var><dd>Specify ATMEL AVR instruction set or MCU type.
<p>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).
<p>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).
<p>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,
attiny2313a, attiny24, attiny24a, attiny4313, attiny44, attiny44a, attiny84,
attiny84a, attiny25, attiny45, attiny85, attiny261, attiny261a, attiny461,
attiny461a, attiny861, attiny861a, attiny87, attiny43u, attiny48, attiny88,
attiny828, at86rf401, ata5272).
<p>Instruction set avr3 is for the classic AVR core with up to 128K program
memory space (MCU types: at43usb355, at76c711).
<p>Instruction set avr31 is for the classic AVR core with exactly 128K program
memory space (MCU types: atmega103, at43usb320).
<p>Instruction set avr35 is for classic AVR core plus MOVW, CALL, and JMP
instructions (MCU types: attiny167, attiny1634, at90usb82, at90usb162,
atmega8u2, atmega16u2, atmega32u2, ata5505).
<p>Instruction set avr4 is for the enhanced AVR core with up to 8K program
memory space (MCU types: atmega48, atmega48a, atmega48pa, atmega48p, atmega8,
atmega8a, atmega88, atmega88a, atmega88p, atmega88pa, atmega8515, atmega8535,
atmega8hva, at90pwm1, at90pwm2, at90pwm2b, at90pwm3, at90pwm3b, at90pwm81,
ata6285, ata6286, ata6289).
<p>Instruction set avr5 is for the enhanced AVR core with up to 128K program
memory space (MCU types: at90pwm161, atmega16, atmega16a, atmega161, atmega162,
atmega163, atmega164a, atmega164p, atmega164pa, atmega165, atmega165a,
atmega165p, atmega165pa, atmega168, atmega168a, atmega168p, atmega168pa,
atmega169, atmega169a, atmega169p, atmega169pa, atmega32, atmega323, atmega324a,
atmega324p, atmega324pa, atmega325, atmega325a, atmega32, atmega32a, atmega323,
atmega324a, atmega324p, atmega324pa, atmega325, atmega325a, atmega325p,
atmega325p, atmega325pa, atmega3250, atmega3250a, atmega3250p, atmega3250pa,
atmega328, atmega328p, atmega329, atmega329a, atmega329p, atmega329pa,
atmega3290a, atmega3290p, atmega3290pa, atmega406, atmega64, atmega64a,
atmega64rfr2, atmega644rfr2, atmega640, atmega644, atmega644a, atmega644p,
atmega644pa, atmega645, atmega645a, atmega645p, atmega6450, atmega6450a,
atmega6450p, atmega649, atmega649a, atmega649p, atmega6490, atmega6490a,
atmega6490p, atmega16hva, atmega16hva2, atmega16hvb, atmega16hvbrevb,
atmega32hvb, atmega32hvbrevb, atmega64hve, at90can32, at90can64, at90pwm161,
at90pwm216, at90pwm316, atmega32c1, atmega64c1, atmega16m1, atmega32m1,
atmega64m1, atmega16u4, atmega32u4, atmega32u6, at90usb646, at90usb647, at94k,
at90scr100, ata5790, ata5795).
<p>Instruction set avr51 is for the enhanced AVR core with exactly 128K
program memory space (MCU types: atmega128, atmega128a, atmega1280,
atmega1281, atmega1284, atmega1284p, atmega128rfa1, atmega128rfr2,
atmega1284rfr2, at90can128, at90usb1286, at90usb1287, m3000).
<p>Instruction set avr6 is for the enhanced AVR core with a 3-byte PC
(MCU types: atmega2560, atmega2561, atmega256rfr2, atmega2564rfr2).
<p>Instruction set avrxmega2 is for the XMEGA AVR core with 8K to 64K
program memory space and less than 64K data space (MCU types:
atxmega16a4, atxmega16a4u, atxmega16c4, atxmega16d4, atxmega16x1,
atxmega32a4, atxmega32a4u, atxmega32c4, atxmega32d4, atxmega16e5,
atxmega8e5, atxmega32e5, atxmega32x1).
<p>Instruction set avrxmega3 is for the XMEGA AVR core with 8K to 64K
program memory space and greater than 64K data space (MCU types:
none).
<p>Instruction set avrxmega4 is for the XMEGA AVR core with up to 64K
program memory space and less than 64K data space (MCU types:
atxmega64a3, atxmega64a3u, atxmega64a4u, atxmega64b1, atxmega64b3,
atxmega64c3, atxmega64d3, atxmega64d4).
<p>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, atxmega64a1u).
<p>Instruction set avrxmega6 is for the XMEGA AVR core with larger than
64K program memory space and less than 64K data space (MCU types:
atxmega128a3, atxmega128a3u, atxmega128c3, atxmega128d3, atxmega128d4,
atxmega192a3, atxmega192a3u, atxmega128b1, atxmega128b3, atxmega192c3,
atxmega192d3, atxmega256a3, atxmega256a3u, atxmega256a3b,
atxmega256a3bu, atxmega256c3, atxmega256d3, atxmega384c3,
atxmega256d3).
<p>Instruction set avrxmega7 is for the XMEGA AVR core with larger than
64K program memory space and greater than 64K data space (MCU types:
atxmega128a1, atxmega128a1u, atxmega128a4u).
<p>Instruction set avrtiny is for the ATtiny4/5/9/10/20/40
microcontrollers.
<p><a name="index-g_t_0040code_007b_002dmall_002dopcodes_007d-command-line-option_002c-AVR-786"></a><br><dt><code>-mall-opcodes</code><dd>Accept all AVR opcodes, even if not supported by <code>-mmcu</code>.
<p><a name="index-g_t_0040code_007b_002dmno_002dskip_002dbug_007d-command-line-option_002c-AVR-787"></a><br><dt><code>-mno-skip-bug</code><dd>This option disable warnings for skipping two-word instructions.
<p><a name="index-g_t_0040code_007b_002dmno_002dwrap_007d-command-line-option_002c-AVR-788"></a><br><dt><code>-mno-wrap</code><dd>This option reject <code>rjmp/rcall</code> instructions with 8K wrap-around.
<p><a name="index-g_t_0040code_007b_002dmrmw_007d-command-line-option_002c-AVR-789"></a><br><dt><code>-mrmw</code><dd>Accept Read-Modify-Write (<code>XCH,LAC,LAS,LAT</code>) instructions.
<p><a name="index-g_t_0040code_007b_002dmlink_002drelax_007d-command-line-option_002c-AVR-790"></a><br><dt><code>-mlink-relax</code><dd>Enable support for link-time relaxation. This is now on by default
and this flag no longer has any effect.
<p><a name="index-g_t_0040code_007b_002dmno_002dlink_002drelax_007d-command-line-option_002c-AVR-791"></a><br><dt><code>-mno-link-relax</code><dd>Disable support for link-time relaxation. The assembler will resolve
relocations when it can, and may be able to better compress some debug
information.
</dl>
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