D30V_002dRegs.html 5.2 KB

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  63. <a name="Register-Names-6"></a>
  64. <h4 class="subsubsection">9.10.2.5 Register Names</h4>
  65. <a name="index-D30V-registers"></a>
  66. <a name="index-registers_002c-D30V"></a>
  67. <p>You can use the predefined symbols &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r63</samp>&rsquo; to refer
  68. to the D30V registers. You can also use &lsquo;<samp>sp</samp>&rsquo; as an alias for
  69. &lsquo;<samp>r63</samp>&rsquo; and &lsquo;<samp>link</samp>&rsquo; as an alias for &lsquo;<samp>r62</samp>&rsquo;. The accumulators
  70. are &lsquo;<samp>a0</samp>&rsquo; and &lsquo;<samp>a1</samp>&rsquo;.
  71. </p>
  72. <p>The D30V also has predefined symbols for these control registers and status bits:
  73. </p><dl compact="compact">
  74. <dt><code>psw</code></dt>
  75. <dd><p>Processor Status Word
  76. </p></dd>
  77. <dt><code>bpsw</code></dt>
  78. <dd><p>Backup Processor Status Word
  79. </p></dd>
  80. <dt><code>pc</code></dt>
  81. <dd><p>Program Counter
  82. </p></dd>
  83. <dt><code>bpc</code></dt>
  84. <dd><p>Backup Program Counter
  85. </p></dd>
  86. <dt><code>rpt_c</code></dt>
  87. <dd><p>Repeat Count
  88. </p></dd>
  89. <dt><code>rpt_s</code></dt>
  90. <dd><p>Repeat Start address
  91. </p></dd>
  92. <dt><code>rpt_e</code></dt>
  93. <dd><p>Repeat End address
  94. </p></dd>
  95. <dt><code>mod_s</code></dt>
  96. <dd><p>Modulo Start address
  97. </p></dd>
  98. <dt><code>mod_e</code></dt>
  99. <dd><p>Modulo End address
  100. </p></dd>
  101. <dt><code>iba</code></dt>
  102. <dd><p>Instruction Break Address
  103. </p></dd>
  104. <dt><code>f0</code></dt>
  105. <dd><p>Flag 0
  106. </p></dd>
  107. <dt><code>f1</code></dt>
  108. <dd><p>Flag 1
  109. </p></dd>
  110. <dt><code>f2</code></dt>
  111. <dd><p>Flag 2
  112. </p></dd>
  113. <dt><code>f3</code></dt>
  114. <dd><p>Flag 3
  115. </p></dd>
  116. <dt><code>f4</code></dt>
  117. <dd><p>Flag 4
  118. </p></dd>
  119. <dt><code>f5</code></dt>
  120. <dd><p>Flag 5
  121. </p></dd>
  122. <dt><code>f6</code></dt>
  123. <dd><p>Flag 6
  124. </p></dd>
  125. <dt><code>f7</code></dt>
  126. <dd><p>Flag 7
  127. </p></dd>
  128. <dt><code>s</code></dt>
  129. <dd><p>Same as flag 4 (saturation flag)
  130. </p></dd>
  131. <dt><code>v</code></dt>
  132. <dd><p>Same as flag 5 (overflow flag)
  133. </p></dd>
  134. <dt><code>va</code></dt>
  135. <dd><p>Same as flag 6 (sticky overflow flag)
  136. </p></dd>
  137. <dt><code>c</code></dt>
  138. <dd><p>Same as flag 7 (carry/borrow flag)
  139. </p></dd>
  140. <dt><code>b</code></dt>
  141. <dd><p>Same as flag 7 (carry/borrow flag)
  142. </p></dd>
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