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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU Assembler "as".

  4. 

  5. Copyright (C) 1991-2020 Free Software Foundation, Inc.

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  17. <title>H8/300-Regs (Using as)</title>

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  26. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  27. <link href="H8_002f300-Syntax.html#H8_002f300-Syntax" rel="up" title="H8/300 Syntax">

  28. <link href="H8_002f300_002dAddressing.html#H8_002f300_002dAddressing" rel="next" title="H8/300-Addressing">

  29. <link href="H8_002f300_002dChars.html#H8_002f300_002dChars" rel="prev" title="H8/300-Chars">

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  64. <p>

  65. Next: <a href="H8_002f300_002dAddressing.html#H8_002f300_002dAddressing" accesskey="n" rel="next">H8/300-Addressing</a>, Previous: <a href="H8_002f300_002dChars.html#H8_002f300_002dChars" accesskey="p" rel="prev">H8/300-Chars</a>, Up: <a href="H8_002f300-Syntax.html#H8_002f300-Syntax" accesskey="u" rel="up">H8/300 Syntax</a> &nbsp; [<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>

  66. </div>

  67. <hr>

  68. <a name="Register-Names-8"></a>

  69. <h4 class="subsubsection">9.14.2.2 Register Names</h4>

  70. 

  71. <a name="index-H8_002f300-registers"></a>

  72. <a name="index-register-names_002c-H8_002f300"></a>

  73. <p>You can use predefined symbols of the form &lsquo;<samp>r<var>n</var>h</samp>&rsquo; and

  74. &lsquo;<samp>r<var>n</var>l</samp>&rsquo; to refer to the H8/300 registers as sixteen 8-bit

  75. general-purpose registers.  <var>n</var> is a digit from &lsquo;<samp>0</samp>&rsquo; to

  76. &lsquo;<samp>7</samp>&rsquo;); for instance, both &lsquo;<samp>r0h</samp>&rsquo; and &lsquo;<samp>r7l</samp>&rsquo; are valid

  77. register names.

  78. </p>

  79. <p>You can also use the eight predefined symbols &lsquo;<samp>r<var>n</var></samp>&rsquo; to refer

  80. to the H8/300 registers as 16-bit registers (you must use this form for

  81. addressing).

  82. </p>

  83. <p>On the H8/300H, you can also use the eight predefined symbols

  84. &lsquo;<samp>er<var>n</var></samp>&rsquo; (&lsquo;<samp>er0</samp>&rsquo; &hellip; &lsquo;<samp>er7</samp>&rsquo;) to refer to the 32-bit

  85. general purpose registers.

  86. </p>

  87. <p>The two control registers are called <code>pc</code> (program counter; a

  88. 16-bit register, except on the H8/300H where it is 24 bits) and

  89. <code>ccr</code> (condition code register; an 8-bit register).  <code>r7</code> is

  90. used as the stack pointer, and can also be called <code>sp</code>.

  91. </p>

  92. 

  93. 

  94. 

  95. </body>

  96. </html>