168 lines
6.6 KiB
HTML
168 lines
6.6 KiB
HTML
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<title>AVRDUDE: 4.3.2 Instruction Format</title>
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<a name="Instruction-Format"></a>
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<table class="header" cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="avrdude_9.html#Configuration-File" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_13.html#Parent-Part" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_12.html#Part-Definitions" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_15.html#Other-Notes" title="Next section in reading order"> > </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_16.html#Programmer-Specific-Information" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="avrdude.html#Introduction" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[Index]</td>
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<td valign="middle" align="left">[<a href="avrdude_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<hr>
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<a name="Instruction-Format-1"></a>
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<h3 class="subsection">4.3.2 Instruction Format</h3>
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<p>Instruction formats are specified as a comma separated list of string
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values containing information (bit specifiers) about each of the 32 bits
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of the instruction. Bit specifiers may be one of the following formats:
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</p>
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<dl compact="compact">
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<dt><code>1</code></dt>
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<dd><p>The bit is always set on input as well as output
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</p>
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</dd>
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<dt><code>0</code></dt>
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<dd><p>the bit is always clear on input as well as output
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</p>
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</dd>
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<dt><code>x</code></dt>
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<dd><p>the bit is ignored on input and output
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</p>
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</dd>
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<dt><code>a</code></dt>
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<dd><p>the bit is an address bit, the bit-number matches this bit specifier’s
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position within the current instruction byte
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</p>
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</dd>
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<dt><code>a<var>N</var></code></dt>
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<dd><p>the bit is the <var>N</var>th address bit, bit-number = N, i.e., <code>a12</code>
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is address bit 12 on input, <code>a0</code> is address bit 0.
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</p>
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</dd>
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<dt><code>i</code></dt>
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<dd><p>the bit is an input data bit
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</p>
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</dd>
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<dt><code>o</code></dt>
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<dd><p>the bit is an output data bit
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</p>
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</dd>
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</dl>
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<p>Each instruction must be composed of 32 bit specifiers. The instruction
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specification closely follows the instruction data provided in Atmel’s
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data sheets for their parts. For example, the EEPROM read and write
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instruction for an AT90S2313 AVR part could be encoded as:
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</p>
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<div class="smallexample">
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<pre class="smallexample">
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read = "1 0 1 0 0 0 0 0 x x x x x x x x",
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"x a6 a5 a4 a3 a2 a1 a0 o o o o o o o o";
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write = "1 1 0 0 0 0 0 0 x x x x x x x x",
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"x a6 a5 a4 a3 a2 a1 a0 i i i i i i i i";
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</pre></div>
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<hr>
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<table class="header" cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="avrdude_9.html#Configuration-File" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_13.html#Parent-Part" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_12.html#Part-Definitions" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_15.html#Other-Notes" title="Next section in reading order"> > </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_16.html#Programmer-Specific-Information" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="avrdude.html#Introduction" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[Index]</td>
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<td valign="middle" align="left">[<a href="avrdude_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<p>
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