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- <a name="XGATE_002dSyntax"></a>
- <div class="header">
- <p>
- Next: <a href="XGATE_002dDirectives.html#XGATE_002dDirectives" accesskey="n" rel="next">XGATE-Directives</a>, Previous: <a href="XGATE_002dOpts.html#XGATE_002dOpts" accesskey="p" rel="prev">XGATE-Opts</a>, Up: <a href="XGATE_002dDependent.html#XGATE_002dDependent" accesskey="u" rel="up">XGATE-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
- </div>
- <hr>
- <a name="Syntax-33"></a>
- <h4 class="subsection">9.53.2 Syntax</h4>
-
- <a name="index-XGATE-syntax"></a>
- <a name="index-syntax_002c-XGATE"></a>
-
- <p>In XGATE RISC syntax, the instruction name comes first and it may
- be followed by up to three operands. Operands are separated by commas
- (‘<samp>,</samp>’). <code>as</code> will complain if too many operands are specified
- for a given instruction. The same will happen if you specified too few
- operands.
- </p>
- <div class="smallexample">
- <pre class="smallexample">nop
- ldl #23
- CMP R1, R2
- </pre></div>
-
- <a name="index-line-comment-character_002c-XGATE"></a>
- <a name="index-XGATE-line-comment-character"></a>
- <p>The presence of a ‘<samp>;</samp>’ character or a ‘<samp>!</samp>’ character anywhere
- on a line indicates the start of a comment that extends to the end of
- that line.
- </p>
- <p>A ‘<samp>*</samp>’ or a ‘<samp>#</samp>’ character at the start of a line also
- introduces a line comment, but these characters do not work elsewhere
- on the line. If the first character of the line is a ‘<samp>#</samp>’ then as
- well as starting a comment, the line could also be logical line number
- directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor control command
- (see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
- </p>
- <a name="index-line-separator_002c-XGATE"></a>
- <a name="index-statement-separator_002c-XGATE"></a>
- <a name="index-XGATE-line-separator"></a>
- <p>The XGATE assembler does not currently support a line separator
- character.
- </p>
- <a name="index-XGATE-addressing-modes"></a>
- <a name="index-addressing-modes_002c-XGATE"></a>
- <p>The following addressing modes are understood for XGATE:
- </p><dl compact="compact">
- <dt><em>Inherent</em></dt>
- <dd><p>‘<samp></samp>’
- </p>
- </dd>
- <dt><em>Immediate 3 Bit Wide</em></dt>
- <dd><p>‘<samp>#<var>number</var></samp>’
- </p>
- </dd>
- <dt><em>Immediate 4 Bit Wide</em></dt>
- <dd><p>‘<samp>#<var>number</var></samp>’
- </p>
- </dd>
- <dt><em>Immediate 8 Bit Wide</em></dt>
- <dd><p>‘<samp>#<var>number</var></samp>’
- </p>
- </dd>
- <dt><em>Monadic Addressing</em></dt>
- <dd><p>‘<samp><var>reg</var></samp>’
- </p>
- </dd>
- <dt><em>Dyadic Addressing</em></dt>
- <dd><p>‘<samp><var>reg</var>, <var>reg</var></samp>’
- </p>
- </dd>
- <dt><em>Triadic Addressing</em></dt>
- <dd><p>‘<samp><var>reg</var>, <var>reg</var>, <var>reg</var></samp>’
- </p>
- </dd>
- <dt><em>Relative Addressing 9 Bit Wide</em></dt>
- <dd><p>‘<samp>*<var>symbol</var></samp>’
- </p>
- </dd>
- <dt><em>Relative Addressing 10 Bit Wide</em></dt>
- <dd><p>‘<samp>*<var>symbol</var></samp>’
- </p>
- </dd>
- <dt><em>Index Register plus Immediate Offset</em></dt>
- <dd><p>‘<samp><var>reg</var>, (<var>reg</var>, #<var>number</var>)</samp>’
- </p>
- </dd>
- <dt><em>Index Register plus Register Offset</em></dt>
- <dd><p>‘<samp><var>reg</var>, <var>reg</var>, <var>reg</var></samp>’
- </p>
- </dd>
- <dt><em>Index Register plus Register Offset with Post-increment</em></dt>
- <dd><p>‘<samp><var>reg</var>, <var>reg</var>, <var>reg</var>+</samp>’
- </p>
- </dd>
- <dt><em>Index Register plus Register Offset with Pre-decrement</em></dt>
- <dd><p>‘<samp><var>reg</var>, <var>reg</var>, -<var>reg</var></samp>’
- </p>
- <p>The register can be either ‘<samp>R0</samp>’, ‘<samp>R1</samp>’, ‘<samp>R2</samp>’, ‘<samp>R3</samp>’,
- ‘<samp>R4</samp>’, ‘<samp>R5</samp>’, ‘<samp>R6</samp>’ or ‘<samp>R7</samp>’.
- </p>
- </dd>
- </dl>
-
- <p>Convene macro opcodes to deal with 16-bit values have been added.
- </p>
- <dl compact="compact">
- <dt><em>Immediate 16 Bit Wide</em></dt>
- <dd><p>‘<samp>#<var>number</var></samp>’, or ‘<samp>*<var>symbol</var></samp>’
- </p>
- <p>For example:
- </p>
- <div class="smallexample">
- <pre class="smallexample">ldw R1, #1024
- ldw R3, timer
- ldw R1, (R1, #0)
- COM R1
- stw R2, (R1, #0)
- </pre></div>
- </dd>
- </dl>
-
- <hr>
- <div class="header">
- <p>
- Next: <a href="XGATE_002dDirectives.html#XGATE_002dDirectives" accesskey="n" rel="next">XGATE-Directives</a>, Previous: <a href="XGATE_002dOpts.html#XGATE_002dOpts" accesskey="p" rel="prev">XGATE-Opts</a>, Up: <a href="XGATE_002dDependent.html#XGATE_002dDependent" accesskey="u" rel="up">XGATE-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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