| <html lang="en"> |
| <head> |
| <title>AVR Options - Using the GNU Compiler Collection (GCC)</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using the GNU Compiler Collection (GCC)"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Submodel-Options.html#Submodel-Options" title="Submodel Options"> |
| <link rel="prev" href="ARM-Options.html#ARM-Options" title="ARM Options"> |
| <link rel="next" href="Blackfin-Options.html#Blackfin-Options" title="Blackfin Options"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.2 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="AVR-Options"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Blackfin-Options.html#Blackfin-Options">Blackfin Options</a>, |
| Previous: <a rel="previous" accesskey="p" href="ARM-Options.html#ARM-Options">ARM Options</a>, |
| Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel-Options">Submodel Options</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">3.17.3 AVR Options</h4> |
| |
| <p><a name="index-AVR-Options-1036"></a> |
| These options are defined for AVR implementations: |
| |
| <dl> |
| <dt><code>-mmcu=</code><var>mcu</var><dd><a name="index-mmcu-1037"></a>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, attiny10, |
| 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, attiny22, |
| at90s2333, at90s2343, at90s4414, at90s4433, at90s4434, at90s8515, |
| at90c8534, at90s8535). |
| |
| <p>Instruction set avr3 is for the classic AVR core with up to 128K program |
| memory space (MCU types: atmega103, atmega603, at43usb320, at76c711). |
| |
| <p>Instruction set avr4 is for the enhanced AVR core with up to 8K program |
| memory space (MCU types: atmega8, atmega83, atmega85). |
| |
| <p>Instruction set avr5 is for the enhanced AVR core with up to 128K program |
| memory space (MCU types: atmega16, atmega161, atmega163, atmega32, atmega323, |
| atmega64, atmega128, at43usb355, at94k). |
| |
| <br><dt><code>-mno-interrupts</code><dd><a name="index-mno_002dinterrupts-1038"></a>Generated code is not compatible with hardware interrupts. |
| Code size will be smaller. |
| |
| <br><dt><code>-mcall-prologues</code><dd><a name="index-mcall_002dprologues-1039"></a>Functions prologues/epilogues expanded as call to appropriate |
| subroutines. Code size will be smaller. |
| |
| <br><dt><code>-mtiny-stack</code><dd><a name="index-mtiny_002dstack-1040"></a>Change only the low 8 bits of the stack pointer. |
| |
| <br><dt><code>-mint8</code><dd><a name="index-mint8-1041"></a>Assume int to be 8 bit integer. This affects the sizes of all types: A |
| char will be 1 byte, an int will be 1 byte, a long will be 2 bytes |
| and long long will be 4 bytes. Please note that this option does not |
| comply to the C standards, but it will provide you with smaller code |
| size. |
| </dl> |
| |
| </body></html> |
| |
