begriffs open source - cmsis/blob - main/Core/group__intrinsic__CPU__gr.html

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 126 <div class="header">
 127   <div class="summary">
 128 <a href="#func-members">Functions</a>  </div>
 129   <div class="headertitle"><div class="title">Intrinsic Functions for CPU Instructions</div></div>
 130 </div><!--header-->
 131 <div class="contents">
 132
 133 <p>Functions that generate specific Cortex-M CPU Instructions.
 134 <a href="#details">More...</a></p>
 135 <table class="memberdecls">
 136 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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 139 <tr class="memdesc:ga92f5621626711931da71eaa8bf301af7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Set Breakpoint.  <br /></td></tr>
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 141 <tr class="memitem:ga354c5ac8870cc3dfb823367af9c4b412"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga354c5ac8870cc3dfb823367af9c4b412">__CLREX</a> (void)</td></tr>
 142 <tr class="memdesc:ga354c5ac8870cc3dfb823367af9c4b412"><td class="mdescLeft">&#160;</td><td class="mdescRight">Remove the exclusive lock [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
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 144 <tr class="memitem:ga90884c591ac5d73d6069334eba9d6c02"><td class="memItemLeft" align="right" valign="top">uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga90884c591ac5d73d6069334eba9d6c02">__CLZ</a> (uint32_t value)</td></tr>
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 148 <tr class="memdesc:gab1c9b393641dc2d397b3408fdbe72b96"><td class="mdescLeft">&#160;</td><td class="mdescRight">Data Memory Barrier.  <br /></td></tr>
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 151 <tr class="memdesc:gacb2a8ca6eae1ba4b31161578b720c199"><td class="mdescLeft">&#160;</td><td class="mdescRight">Data Synchronization Barrier.  <br /></td></tr>
 152 <tr class="separator:gacb2a8ca6eae1ba4b31161578b720c199"><td class="memSeparator" colspan="2">&#160;</td></tr>
 153 <tr class="memitem:ga93c09b4709394d81977300d5f84950e5"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga93c09b4709394d81977300d5f84950e5">__ISB</a> (void)</td></tr>
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 157 <tr class="memdesc:ga22a24f416b65c2f5a82d9f1162d9394d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Load-Acquire (32 bit)  <br /></td></tr>
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 160 <tr class="memdesc:ga263b9b2d9c06d731022873acddb6aa3f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Load-Acquire (8 bit)  <br /></td></tr>
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 162 <tr class="memitem:ga3c74d923529f664eda099d1b2668b3c1"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga3c74d923529f664eda099d1b2668b3c1">__LDAEX</a> (volatile uint32_t *ptr)</td></tr>
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 169 <tr class="memdesc:ga426b61640fc68f21b21ae4dc2726f3b4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Load-Acquire Exclusive (16 bit)  <br /></td></tr>
 170 <tr class="separator:ga426b61640fc68f21b21ae4dc2726f3b4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 175 <tr class="memdesc:ga9464d75db32846aa8295c3c3adfacb41"><td class="mdescLeft">&#160;</td><td class="mdescRight">LDRT Unprivileged (8 bit)  <br /></td></tr>
 176 <tr class="separator:ga9464d75db32846aa8295c3c3adfacb41"><td class="memSeparator" colspan="2">&#160;</td></tr>
 177 <tr class="memitem:ga9e3ac13d8dcf4331176b624cf6234a7e"><td class="memItemLeft" align="right" valign="top">uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga9e3ac13d8dcf4331176b624cf6234a7e">__LDREXB</a> (volatile uint8_t *addr)</td></tr>
 178 <tr class="memdesc:ga9e3ac13d8dcf4331176b624cf6234a7e"><td class="mdescLeft">&#160;</td><td class="mdescRight">LDR Exclusive (8 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
 179 <tr class="separator:ga9e3ac13d8dcf4331176b624cf6234a7e"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 181 <tr class="memdesc:ga9feffc093d6f68b120d592a7a0d45a15"><td class="mdescLeft">&#160;</td><td class="mdescRight">LDR Exclusive (16 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
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 184 <tr class="memdesc:gabd78840a0f2464905b7cec791ebc6a4c"><td class="mdescLeft">&#160;</td><td class="mdescRight">LDR Exclusive (32 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
 185 <tr class="separator:gabd78840a0f2464905b7cec791ebc6a4c"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 187 <tr class="memdesc:gaa762b8bc5634ce38cb14d62a6b2aee32"><td class="mdescLeft">&#160;</td><td class="mdescRight">LDRT Unprivileged (16 bit)  <br /></td></tr>
 188 <tr class="separator:gaa762b8bc5634ce38cb14d62a6b2aee32"><td class="memSeparator" colspan="2">&#160;</td></tr>
 189 <tr class="memitem:ga616504f5da979ba8a073d428d6e8d5c7"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga616504f5da979ba8a073d428d6e8d5c7">__LDRT</a> (uint32_t ptr)</td></tr>
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 193 <tr class="memdesc:gac71fad9f0a91980fecafcb450ee0a63e"><td class="mdescLeft">&#160;</td><td class="mdescRight">No Operation.  <br /></td></tr>
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 195 <tr class="memitem:gad6f9f297f6b91a995ee199fbc796b863"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#gad6f9f297f6b91a995ee199fbc796b863">__RBIT</a> (uint32_t value)</td></tr>
 196 <tr class="memdesc:gad6f9f297f6b91a995ee199fbc796b863"><td class="mdescLeft">&#160;</td><td class="mdescRight">Reverse bit order of value.  <br /></td></tr>
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 211 <tr class="memdesc:gac09134f1bf9c49db07282001afcc9380"><td class="mdescLeft">&#160;</td><td class="mdescRight">Rotate Right with Extend (32 bit)  <br /></td></tr>
 212 <tr class="separator:gac09134f1bf9c49db07282001afcc9380"><td class="memSeparator" colspan="2">&#160;</td></tr>
 213 <tr class="memitem:ga3c34da7eb16496ae2668a5b95fa441e7"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga3c34da7eb16496ae2668a5b95fa441e7">__SEV</a> (void)</td></tr>
 214 <tr class="memdesc:ga3c34da7eb16496ae2668a5b95fa441e7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Send Event.  <br /></td></tr>
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 217 <tr class="memdesc:ga8cfeb5ffe0e49ec6b29dafdde92e5118"><td class="mdescLeft">&#160;</td><td class="mdescRight">Signed Saturate.  <br /></td></tr>
 218 <tr class="separator:ga8cfeb5ffe0e49ec6b29dafdde92e5118"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 223 <tr class="memdesc:gace025d3a1f85d2ab9bae7288838d6bc8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Store-Release (8 bit)  <br /></td></tr>
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 226 <tr class="memdesc:gae7f955b91595cfd82a03e4b437c59afe"><td class="mdescLeft">&#160;</td><td class="mdescRight">Store-Release Exclusive (32 bit)  <br /></td></tr>
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 229 <tr class="memdesc:ga590724a32a229978536fbbbd6cc82536"><td class="mdescLeft">&#160;</td><td class="mdescRight">Store-Release Exclusive (8 bit)  <br /></td></tr>
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 238 <tr class="memdesc:gad41aa59c92c0a165b7f98428d3320cd5"><td class="mdescLeft">&#160;</td><td class="mdescRight">STRT Unprivileged (8 bit)  <br /></td></tr>
 239 <tr class="separator:gad41aa59c92c0a165b7f98428d3320cd5"><td class="memSeparator" colspan="2">&#160;</td></tr>
 240 <tr class="memitem:gaab6482d1f59f59e2b6b7efc1af391c99"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#gaab6482d1f59f59e2b6b7efc1af391c99">__STREXB</a> (uint8_t value, volatile uint8_t *addr)</td></tr>
 241 <tr class="memdesc:gaab6482d1f59f59e2b6b7efc1af391c99"><td class="mdescLeft">&#160;</td><td class="mdescRight">STR Exclusive (8 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
 242 <tr class="separator:gaab6482d1f59f59e2b6b7efc1af391c99"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 244 <tr class="memdesc:ga0a354bdf71caa52f081a4a54e84c8d2a"><td class="mdescLeft">&#160;</td><td class="mdescRight">STR Exclusive (16 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
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 247 <tr class="memdesc:ga335deaaa7991490e1450cb7d1e4c5197"><td class="mdescLeft">&#160;</td><td class="mdescRight">STR Exclusive (32 bit) [not for Cortex-M0, Cortex-M0+, or SC000].  <br /></td></tr>
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 250 <tr class="memdesc:ga2b5d93b8e461755b1072a03df3f1722e"><td class="mdescLeft">&#160;</td><td class="mdescRight">STRT Unprivileged (16 bit)  <br /></td></tr>
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 252 <tr class="memitem:ga625bc4ac0b1d50de9bcd13d9f050030e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#ga625bc4ac0b1d50de9bcd13d9f050030e">__STRT</a> (uint32_t value, uint32_t ptr)</td></tr>
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 256 <tr class="memdesc:ga9ba87371aebd17dd6244ed3458b29b5d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Unsigned Saturate.  <br /></td></tr>
 257 <tr class="separator:ga9ba87371aebd17dd6244ed3458b29b5d"><td class="memSeparator" colspan="2">&#160;</td></tr>
 258 <tr class="memitem:gad3efec76c3bfa2b8528ded530386c563"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#gad3efec76c3bfa2b8528ded530386c563">__WFE</a> (void)</td></tr>
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 260 <tr class="separator:gad3efec76c3bfa2b8528ded530386c563"><td class="memSeparator" colspan="2">&#160;</td></tr>
 261 <tr class="memitem:gaed91dfbf3d7d7b7fba8d912fcbeaad88"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__intrinsic__CPU__gr.html#gaed91dfbf3d7d7b7fba8d912fcbeaad88">__WFI</a> (void)</td></tr>
 262 <tr class="memdesc:gaed91dfbf3d7d7b7fba8d912fcbeaad88"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait For Interrupt.  <br /></td></tr>
 263 <tr class="separator:gaed91dfbf3d7d7b7fba8d912fcbeaad88"><td class="memSeparator" colspan="2">&#160;</td></tr>
 264 </table>
 265 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 266 <p>Functions that generate specific Cortex-M CPU Instructions. </p>
 267 <p>The following functions generate specific Cortex-M instructions that cannot be directly accessed by the C/C++ Compiler. Refer to the <a class="el" href="index.html#ref_man_sec">Cortex-M Generic User Guides</a> for detailed information about these Cortex-M instructions.</p>
 268 <dl class="section note"><dt>Note</dt><dd>When using the <b>Arm Compiler Version 5 Toolchain</b> the following <a class="el" href="group__intrinsic__CPU__gr.html">Intrinsic Functions for CPU Instructions</a> are implemented using the Embedded Assembler. As the Embedded Assembler may cause side effects (Refer to <b>Arm Compiler v5.xx User Guide - Using the Inline and Embedded Assemblers of the Arm Compiler</b> for more information) it is possible to disable the following intrinsic functions and therefore the usage of the Embedded Assembler with the <b><em>define __NO_EMBEDDED_ASM</em></b>:<ul>
 269 <li><a class="el" href="group__intrinsic__CPU__gr.html#gaeef6f853b6df3a365c838ee5b49a7a26">__REV16</a></li>
 270 <li><a class="el" href="group__intrinsic__CPU__gr.html#ga211618c03a0bf3264a7b22ad626d4f0a">__REVSH</a></li>
 271 <li><a class="el" href="group__intrinsic__CPU__gr.html#gac09134f1bf9c49db07282001afcc9380">__RRX</a> </li>
 272 </ul>
 273 </dd></dl>
 274 <h2 class="groupheader">Function Documentation</h2>
 275 <a id="ga92f5621626711931da71eaa8bf301af7" name="ga92f5621626711931da71eaa8bf301af7"></a>
 276 <h2 class="memtitle"><span class="permalink"><a href="#ga92f5621626711931da71eaa8bf301af7">&#9670;&#160;</a></span>__BKPT()</h2>
 277
 278 <div class="memitem">
 279 <div class="memproto">
 280       <table class="memname">
 281         <tr>
 282           <td class="memname">void __BKPT </td>
 283           <td>(</td>
 284           <td class="paramtype">uint8_t&#160;</td>
 285           <td class="paramname"><em>value</em></td><td>)</td>
 286           <td></td>
 287         </tr>
 288       </table>
 289 </div><div class="memdoc">
 290
 291 <p>Set Breakpoint. </p>
 292 <p>This function causes the processor to enter Debug state. Debug tools can use this to investigate system state when the instruction at a particular address is reached.</p>
 293 <dl class="params"><dt>Parameters</dt><dd>
 294   <table class="params">
 295     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>is ignored by the processor. If required, a debugger can use it to obtain additional information about the breakpoint. </td></tr>
 296   </table>
 297   </dd>
 298 </dl>
 299
 300 </div>
 301 </div>
 302 <a id="ga354c5ac8870cc3dfb823367af9c4b412" name="ga354c5ac8870cc3dfb823367af9c4b412"></a>
 303 <h2 class="memtitle"><span class="permalink"><a href="#ga354c5ac8870cc3dfb823367af9c4b412">&#9670;&#160;</a></span>__CLREX()</h2>
 304
 305 <div class="memitem">
 306 <div class="memproto">
 307       <table class="memname">
 308         <tr>
 309           <td class="memname">void __CLREX </td>
 310           <td>(</td>
 311           <td class="paramtype">void&#160;</td>
 312           <td class="paramname"></td><td>)</td>
 313           <td></td>
 314         </tr>
 315       </table>
 316 </div><div class="memdoc">
 317
 318 <p>Remove the exclusive lock [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
 319 <p>This function removes the exclusive lock which is created by LDREX [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
 320
 321 </div>
 322 </div>
 323 <a id="ga90884c591ac5d73d6069334eba9d6c02" name="ga90884c591ac5d73d6069334eba9d6c02"></a>
 324 <h2 class="memtitle"><span class="permalink"><a href="#ga90884c591ac5d73d6069334eba9d6c02">&#9670;&#160;</a></span>__CLZ()</h2>
 325
 326 <div class="memitem">
 327 <div class="memproto">
 328       <table class="memname">
 329         <tr>
 330           <td class="memname">uint8_t __CLZ </td>
 331           <td>(</td>
 332           <td class="paramtype">uint32_t&#160;</td>
 333           <td class="paramname"><em>value</em></td><td>)</td>
 334           <td></td>
 335         </tr>
 336       </table>
 337 </div><div class="memdoc">
 338
 339 <p>Count leading zeros. </p>
 340 <p>This function counts the number of leading zeros of a data value.</p>
 341 <p>On Armv6-M (Cortex-M0, Cortex-M0+, and SC000) this function is not available as a core instruction instruction and thus __CLZ is implemented in software.</p>
 342 <dl class="params"><dt>Parameters</dt><dd>
 343   <table class="params">
 344     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to count the leading zeros </td></tr>
 345   </table>
 346   </dd>
 347 </dl>
 348 <dl class="section return"><dt>Returns</dt><dd>number of leading zeros in value </dd></dl>
 349
 350 </div>
 351 </div>
 352 <a id="gab1c9b393641dc2d397b3408fdbe72b96" name="gab1c9b393641dc2d397b3408fdbe72b96"></a>
 353 <h2 class="memtitle"><span class="permalink"><a href="#gab1c9b393641dc2d397b3408fdbe72b96">&#9670;&#160;</a></span>__DMB()</h2>
 354
 355 <div class="memitem">
 356 <div class="memproto">
 357       <table class="memname">
 358         <tr>
 359           <td class="memname">void __DMB </td>
 360           <td>(</td>
 361           <td class="paramtype">void&#160;</td>
 362           <td class="paramname"></td><td>)</td>
 363           <td></td>
 364         </tr>
 365       </table>
 366 </div><div class="memdoc">
 367
 368 <p>Data Memory Barrier. </p>
 369 <p>This function ensures the apparent order of the explicit memory operations before and after the instruction, without ensuring their completion. </p>
 370
 371 </div>
 372 </div>
 373 <a id="gacb2a8ca6eae1ba4b31161578b720c199" name="gacb2a8ca6eae1ba4b31161578b720c199"></a>
 374 <h2 class="memtitle"><span class="permalink"><a href="#gacb2a8ca6eae1ba4b31161578b720c199">&#9670;&#160;</a></span>__DSB()</h2>
 375
 376 <div class="memitem">
 377 <div class="memproto">
 378       <table class="memname">
 379         <tr>
 380           <td class="memname">void __DSB </td>
 381           <td>(</td>
 382           <td class="paramtype">void&#160;</td>
 383           <td class="paramname"></td><td>)</td>
 384           <td></td>
 385         </tr>
 386       </table>
 387 </div><div class="memdoc">
 388
 389 <p>Data Synchronization Barrier. </p>
 390 <p>This function acts as a special kind of Data Memory Barrier. It completes when all explicit memory accesses before this instruction complete. </p>
 391
 392 </div>
 393 </div>
 394 <a id="ga93c09b4709394d81977300d5f84950e5" name="ga93c09b4709394d81977300d5f84950e5"></a>
 395 <h2 class="memtitle"><span class="permalink"><a href="#ga93c09b4709394d81977300d5f84950e5">&#9670;&#160;</a></span>__ISB()</h2>
 396
 397 <div class="memitem">
 398 <div class="memproto">
 399       <table class="memname">
 400         <tr>
 401           <td class="memname">void __ISB </td>
 402           <td>(</td>
 403           <td class="paramtype">void&#160;</td>
 404           <td class="paramname"></td><td>)</td>
 405           <td></td>
 406         </tr>
 407       </table>
 408 </div><div class="memdoc">
 409
 410 <p>Instruction Synchronization Barrier. </p>
 411 <p>Instruction Synchronization Barrier flushes the pipeline in the processor, so that all instructions following the ISB are fetched from cache or memory, after the instruction has been completed. </p>
 412
 413 </div>
 414 </div>
 415 <a id="ga22a24f416b65c2f5a82d9f1162d9394d" name="ga22a24f416b65c2f5a82d9f1162d9394d"></a>
 416 <h2 class="memtitle"><span class="permalink"><a href="#ga22a24f416b65c2f5a82d9f1162d9394d">&#9670;&#160;</a></span>__LDA()</h2>
 417
 418 <div class="memitem">
 419 <div class="memproto">
 420       <table class="memname">
 421         <tr>
 422           <td class="memname">uint32_t __LDA </td>
 423           <td>(</td>
 424           <td class="paramtype">volatile uint32_t *&#160;</td>
 425           <td class="paramname"><em>ptr</em></td><td>)</td>
 426           <td></td>
 427         </tr>
 428       </table>
 429 </div><div class="memdoc">
 430
 431 <p>Load-Acquire (32 bit) </p>
 432 <p>Executes a LDA instruction for 32 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
 433   <table class="params">
 434     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 435   </table>
 436   </dd>
 437 </dl>
 438 <dl class="section return"><dt>Returns</dt><dd>value of type uint32_t at (*ptr) </dd></dl>
 439 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 440
 441 </div>
 442 </div>
 443 <a id="ga263b9b2d9c06d731022873acddb6aa3f" name="ga263b9b2d9c06d731022873acddb6aa3f"></a>
 444 <h2 class="memtitle"><span class="permalink"><a href="#ga263b9b2d9c06d731022873acddb6aa3f">&#9670;&#160;</a></span>__LDAB()</h2>
 445
 446 <div class="memitem">
 447 <div class="memproto">
 448       <table class="memname">
 449         <tr>
 450           <td class="memname">uint8_t __LDAB </td>
 451           <td>(</td>
 452           <td class="paramtype">volatile uint8_t *&#160;</td>
 453           <td class="paramname"><em>ptr</em></td><td>)</td>
 454           <td></td>
 455         </tr>
 456       </table>
 457 </div><div class="memdoc">
 458
 459 <p>Load-Acquire (8 bit) </p>
 460 <p>Executes a LDAB instruction for 8 bit value. </p><dl class="params"><dt>Parameters</dt><dd>
 461   <table class="params">
 462     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 463   </table>
 464   </dd>
 465 </dl>
 466 <dl class="section return"><dt>Returns</dt><dd>value of type uint8_t at (*ptr) </dd></dl>
 467 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 468
 469 </div>
 470 </div>
 471 <a id="ga3c74d923529f664eda099d1b2668b3c1" name="ga3c74d923529f664eda099d1b2668b3c1"></a>
 472 <h2 class="memtitle"><span class="permalink"><a href="#ga3c74d923529f664eda099d1b2668b3c1">&#9670;&#160;</a></span>__LDAEX()</h2>
 473
 474 <div class="memitem">
 475 <div class="memproto">
 476       <table class="memname">
 477         <tr>
 478           <td class="memname">uint32_t __LDAEX </td>
 479           <td>(</td>
 480           <td class="paramtype">volatile uint32_t *&#160;</td>
 481           <td class="paramname"><em>ptr</em></td><td>)</td>
 482           <td></td>
 483         </tr>
 484       </table>
 485 </div><div class="memdoc">
 486
 487 <p>Load-Acquire Exclusive (32 bit) </p>
 488 <p>Executes a LDA exclusive instruction for 32 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
 489   <table class="params">
 490     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 491   </table>
 492   </dd>
 493 </dl>
 494 <dl class="section return"><dt>Returns</dt><dd>value of type uint32_t at (*ptr) </dd></dl>
 495 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 496
 497 </div>
 498 </div>
 499 <a id="ga513beada40cdd7123281f22482603bcc" name="ga513beada40cdd7123281f22482603bcc"></a>
 500 <h2 class="memtitle"><span class="permalink"><a href="#ga513beada40cdd7123281f22482603bcc">&#9670;&#160;</a></span>__LDAEXB()</h2>
 501
 502 <div class="memitem">
 503 <div class="memproto">
 504       <table class="memname">
 505         <tr>
 506           <td class="memname">uint8_t __LDAEXB </td>
 507           <td>(</td>
 508           <td class="paramtype">volatile uint32_t *&#160;</td>
 509           <td class="paramname"><em>ptr</em></td><td>)</td>
 510           <td></td>
 511         </tr>
 512       </table>
 513 </div><div class="memdoc">
 514
 515 <p>Load-Acquire Exclusive (8 bit) </p>
 516 <p>Executes a LDAB exclusive instruction for 8 bit value. </p><dl class="params"><dt>Parameters</dt><dd>
 517   <table class="params">
 518     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 519   </table>
 520   </dd>
 521 </dl>
 522 <dl class="section return"><dt>Returns</dt><dd>value of type uint8_t at (*ptr) </dd></dl>
 523 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 524
 525 </div>
 526 </div>
 527 <a id="ga426b61640fc68f21b21ae4dc2726f3b4" name="ga426b61640fc68f21b21ae4dc2726f3b4"></a>
 528 <h2 class="memtitle"><span class="permalink"><a href="#ga426b61640fc68f21b21ae4dc2726f3b4">&#9670;&#160;</a></span>__LDAEXH()</h2>
 529
 530 <div class="memitem">
 531 <div class="memproto">
 532       <table class="memname">
 533         <tr>
 534           <td class="memname">uint16_t __LDAEXH </td>
 535           <td>(</td>
 536           <td class="paramtype">volatile uint32_t *&#160;</td>
 537           <td class="paramname"><em>ptr</em></td><td>)</td>
 538           <td></td>
 539         </tr>
 540       </table>
 541 </div><div class="memdoc">
 542
 543 <p>Load-Acquire Exclusive (16 bit) </p>
 544 <p>Executes a LDAH exclusive instruction for 16 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
 545   <table class="params">
 546     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 547   </table>
 548   </dd>
 549 </dl>
 550 <dl class="section return"><dt>Returns</dt><dd>value of type uint16_t at (*ptr) </dd></dl>
 551 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 552
 553 </div>
 554 </div>
 555 <a id="ga5810ac0b87a37e321c2f909cd3860499" name="ga5810ac0b87a37e321c2f909cd3860499"></a>
 556 <h2 class="memtitle"><span class="permalink"><a href="#ga5810ac0b87a37e321c2f909cd3860499">&#9670;&#160;</a></span>__LDAH()</h2>
 557
 558 <div class="memitem">
 559 <div class="memproto">
 560       <table class="memname">
 561         <tr>
 562           <td class="memname">uint16_t __LDAH </td>
 563           <td>(</td>
 564           <td class="paramtype">volatile uint16_t *&#160;</td>
 565           <td class="paramname"><em>ptr</em></td><td>)</td>
 566           <td></td>
 567         </tr>
 568       </table>
 569 </div><div class="memdoc">
 570
 571 <p>Load-Acquire (16 bit) </p>
 572 <p>Executes a LDAH instruction for 16 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
 573   <table class="params">
 574     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 575   </table>
 576   </dd>
 577 </dl>
 578 <dl class="section return"><dt>Returns</dt><dd>value of type uint16_t at (*ptr) </dd></dl>
 579 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
 580
 581 </div>
 582 </div>
 583 <a id="ga9464d75db32846aa8295c3c3adfacb41" name="ga9464d75db32846aa8295c3c3adfacb41"></a>
 584 <h2 class="memtitle"><span class="permalink"><a href="#ga9464d75db32846aa8295c3c3adfacb41">&#9670;&#160;</a></span>__LDRBT()</h2>
 585
 586 <div class="memitem">
 587 <div class="memproto">
 588       <table class="memname">
 589         <tr>
 590           <td class="memname">uint8_t __LDRBT </td>
 591           <td>(</td>
 592           <td class="paramtype">uint8_t&#160;</td>
 593           <td class="paramname"><em>ptr</em></td><td>)</td>
 594           <td></td>
 595         </tr>
 596       </table>
 597 </div><div class="memdoc">
 598
 599 <p>LDRT Unprivileged (8 bit) </p>
 600 <p>This function executed an Unprivileged LDRT command for 8 bit value.</p>
 601 <dl class="params"><dt>Parameters</dt><dd>
 602   <table class="params">
 603     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 604   </table>
 605   </dd>
 606 </dl>
 607 <dl class="section return"><dt>Returns</dt><dd>value of type uint8_t at (*ptr) </dd></dl>
 608
 609 </div>
 610 </div>
 611 <a id="ga9e3ac13d8dcf4331176b624cf6234a7e" name="ga9e3ac13d8dcf4331176b624cf6234a7e"></a>
 612 <h2 class="memtitle"><span class="permalink"><a href="#ga9e3ac13d8dcf4331176b624cf6234a7e">&#9670;&#160;</a></span>__LDREXB()</h2>
 613
 614 <div class="memitem">
 615 <div class="memproto">
 616       <table class="memname">
 617         <tr>
 618           <td class="memname">uint8_t __LDREXB </td>
 619           <td>(</td>
 620           <td class="paramtype">volatile uint8_t *&#160;</td>
 621           <td class="paramname"><em>addr</em></td><td>)</td>
 622           <td></td>
 623         </tr>
 624       </table>
 625 </div><div class="memdoc">
 626
 627 <p>LDR Exclusive (8 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
 628 <p>This function executed an exclusive LDR command for 8 bit value [not for Cortex-M0, Cortex-M0+, or SC000].</p>
 629 <dl class="params"><dt>Parameters</dt><dd>
 630   <table class="params">
 631     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to data </td></tr>
 632   </table>
 633   </dd>
 634 </dl>
 635 <dl class="section return"><dt>Returns</dt><dd>value of type uint8_t at (*addr) </dd></dl>
 636
 637 </div>
 638 </div>
 639 <a id="ga9feffc093d6f68b120d592a7a0d45a15" name="ga9feffc093d6f68b120d592a7a0d45a15"></a>
 640 <h2 class="memtitle"><span class="permalink"><a href="#ga9feffc093d6f68b120d592a7a0d45a15">&#9670;&#160;</a></span>__LDREXH()</h2>
 641
 642 <div class="memitem">
 643 <div class="memproto">
 644       <table class="memname">
 645         <tr>
 646           <td class="memname">uint16_t __LDREXH </td>
 647           <td>(</td>
 648           <td class="paramtype">volatile uint16_t *&#160;</td>
 649           <td class="paramname"><em>addr</em></td><td>)</td>
 650           <td></td>
 651         </tr>
 652       </table>
 653 </div><div class="memdoc">
 654
 655 <p>LDR Exclusive (16 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
 656 <p>This function executed an exclusive LDR command for 16 bit values [not for Cortex-M0, Cortex-M0+, or SC000].</p>
 657 <dl class="params"><dt>Parameters</dt><dd>
 658   <table class="params">
 659     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to data </td></tr>
 660   </table>
 661   </dd>
 662 </dl>
 663 <dl class="section return"><dt>Returns</dt><dd>value of type uint16_t at (*addr) </dd></dl>
 664
 665 </div>
 666 </div>
 667 <a id="gabd78840a0f2464905b7cec791ebc6a4c" name="gabd78840a0f2464905b7cec791ebc6a4c"></a>
 668 <h2 class="memtitle"><span class="permalink"><a href="#gabd78840a0f2464905b7cec791ebc6a4c">&#9670;&#160;</a></span>__LDREXW()</h2>
 669
 670 <div class="memitem">
 671 <div class="memproto">
 672       <table class="memname">
 673         <tr>
 674           <td class="memname">uint32_t __LDREXW </td>
 675           <td>(</td>
 676           <td class="paramtype">volatile uint32_t *&#160;</td>
 677           <td class="paramname"><em>addr</em></td><td>)</td>
 678           <td></td>
 679         </tr>
 680       </table>
 681 </div><div class="memdoc">
 682
 683 <p>LDR Exclusive (32 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
 684 <p>This function executed an exclusive LDR command for 32 bit values [not for Cortex-M0, Cortex-M0+, or SC000].</p>
 685 <dl class="params"><dt>Parameters</dt><dd>
 686   <table class="params">
 687     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to data </td></tr>
 688   </table>
 689   </dd>
 690 </dl>
 691 <dl class="section return"><dt>Returns</dt><dd>value of type uint32_t at (*addr) </dd></dl>
 692
 693 </div>
 694 </div>
 695 <a id="gaa762b8bc5634ce38cb14d62a6b2aee32" name="gaa762b8bc5634ce38cb14d62a6b2aee32"></a>
 696 <h2 class="memtitle"><span class="permalink"><a href="#gaa762b8bc5634ce38cb14d62a6b2aee32">&#9670;&#160;</a></span>__LDRHT()</h2>
 697
 698 <div class="memitem">
 699 <div class="memproto">
 700       <table class="memname">
 701         <tr>
 702           <td class="memname">uint16_t __LDRHT </td>
 703           <td>(</td>
 704           <td class="paramtype">uint16_t&#160;</td>
 705           <td class="paramname"><em>ptr</em></td><td>)</td>
 706           <td></td>
 707         </tr>
 708       </table>
 709 </div><div class="memdoc">
 710
 711 <p>LDRT Unprivileged (16 bit) </p>
 712 <p>This function executed an Unprivileged LDRT command for 16 bit values.</p>
 713 <dl class="params"><dt>Parameters</dt><dd>
 714   <table class="params">
 715     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 716   </table>
 717   </dd>
 718 </dl>
 719 <dl class="section return"><dt>Returns</dt><dd>value of type uint16_t at (*ptr) </dd></dl>
 720
 721 </div>
 722 </div>
 723 <a id="ga616504f5da979ba8a073d428d6e8d5c7" name="ga616504f5da979ba8a073d428d6e8d5c7"></a>
 724 <h2 class="memtitle"><span class="permalink"><a href="#ga616504f5da979ba8a073d428d6e8d5c7">&#9670;&#160;</a></span>__LDRT()</h2>
 725
 726 <div class="memitem">
 727 <div class="memproto">
 728       <table class="memname">
 729         <tr>
 730           <td class="memname">uint32_t __LDRT </td>
 731           <td>(</td>
 732           <td class="paramtype">uint32_t&#160;</td>
 733           <td class="paramname"><em>ptr</em></td><td>)</td>
 734           <td></td>
 735         </tr>
 736       </table>
 737 </div><div class="memdoc">
 738
 739 <p>LDRT Unprivileged (32 bit) </p>
 740 <p>This function executed an Unprivileged LDRT command for 32 bit values.</p>
 741 <dl class="params"><dt>Parameters</dt><dd>
 742   <table class="params">
 743     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to data </td></tr>
 744   </table>
 745   </dd>
 746 </dl>
 747 <dl class="section return"><dt>Returns</dt><dd>value of type uint32_t at (*ptr) </dd></dl>
 748
 749 </div>
 750 </div>
 751 <a id="gac71fad9f0a91980fecafcb450ee0a63e" name="gac71fad9f0a91980fecafcb450ee0a63e"></a>
 752 <h2 class="memtitle"><span class="permalink"><a href="#gac71fad9f0a91980fecafcb450ee0a63e">&#9670;&#160;</a></span>__NOP()</h2>
 753
 754 <div class="memitem">
 755 <div class="memproto">
 756       <table class="memname">
 757         <tr>
 758           <td class="memname">void __NOP </td>
 759           <td>(</td>
 760           <td class="paramtype">void&#160;</td>
 761           <td class="paramname"></td><td>)</td>
 762           <td></td>
 763         </tr>
 764       </table>
 765 </div><div class="memdoc">
 766
 767 <p>No Operation. </p>
 768 <p>This function does nothing. This instruction can be used for code alignment purposes. </p>
 769
 770 </div>
 771 </div>
 772 <a id="gad6f9f297f6b91a995ee199fbc796b863" name="gad6f9f297f6b91a995ee199fbc796b863"></a>
 773 <h2 class="memtitle"><span class="permalink"><a href="#gad6f9f297f6b91a995ee199fbc796b863">&#9670;&#160;</a></span>__RBIT()</h2>
 774
 775 <div class="memitem">
 776 <div class="memproto">
 777       <table class="memname">
 778         <tr>
 779           <td class="memname">uint32_t __RBIT </td>
 780           <td>(</td>
 781           <td class="paramtype">uint32_t&#160;</td>
 782           <td class="paramname"><em>value</em></td><td>)</td>
 783           <td></td>
 784         </tr>
 785       </table>
 786 </div><div class="memdoc">
 787
 788 <p>Reverse bit order of value. </p>
 789 <dl class="params"><dt>Parameters</dt><dd>
 790   <table class="params">
 791     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to reverse </td></tr>
 792   </table>
 793   </dd>
 794 </dl>
 795 <dl class="section return"><dt>Returns</dt><dd>Reversed value </dd></dl>
 796
 797 </div>
 798 </div>
 799 <a id="ga4717abc17af5ba29b1e4c055e0a0d9b8" name="ga4717abc17af5ba29b1e4c055e0a0d9b8"></a>
 800 <h2 class="memtitle"><span class="permalink"><a href="#ga4717abc17af5ba29b1e4c055e0a0d9b8">&#9670;&#160;</a></span>__REV()</h2>
 801
 802 <div class="memitem">
 803 <div class="memproto">
 804       <table class="memname">
 805         <tr>
 806           <td class="memname">uint32_t __REV </td>
 807           <td>(</td>
 808           <td class="paramtype">uint32_t&#160;</td>
 809           <td class="paramname"><em>value</em></td><td>)</td>
 810           <td></td>
 811         </tr>
 812       </table>
 813 </div><div class="memdoc">
 814
 815 <p>Reverse byte order (32 bit) </p>
 816 <p>Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412. </p><dl class="params"><dt>Parameters</dt><dd>
 817   <table class="params">
 818     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to reverse </td></tr>
 819   </table>
 820   </dd>
 821 </dl>
 822 <dl class="section return"><dt>Returns</dt><dd>Reversed value </dd></dl>
 823
 824 </div>
 825 </div>
 826 <a id="gaeef6f853b6df3a365c838ee5b49a7a26" name="gaeef6f853b6df3a365c838ee5b49a7a26"></a>
 827 <h2 class="memtitle"><span class="permalink"><a href="#gaeef6f853b6df3a365c838ee5b49a7a26">&#9670;&#160;</a></span>__REV16()</h2>
 828
 829 <div class="memitem">
 830 <div class="memproto">
 831       <table class="memname">
 832         <tr>
 833           <td class="memname">uint32_t __REV16 </td>
 834           <td>(</td>
 835           <td class="paramtype">uint32_t&#160;</td>
 836           <td class="paramname"><em>value</em></td><td>)</td>
 837           <td></td>
 838         </tr>
 839       </table>
 840 </div><div class="memdoc">
 841
 842 <p>Reverse byte order (16 bit) </p>
 843 <p>Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856. </p><dl class="params"><dt>Parameters</dt><dd>
 844   <table class="params">
 845     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to reverse </td></tr>
 846   </table>
 847   </dd>
 848 </dl>
 849 <dl class="section return"><dt>Returns</dt><dd>Reversed value </dd></dl>
 850
 851 </div>
 852 </div>
 853 <a id="ga211618c03a0bf3264a7b22ad626d4f0a" name="ga211618c03a0bf3264a7b22ad626d4f0a"></a>
 854 <h2 class="memtitle"><span class="permalink"><a href="#ga211618c03a0bf3264a7b22ad626d4f0a">&#9670;&#160;</a></span>__REVSH()</h2>
 855
 856 <div class="memitem">
 857 <div class="memproto">
 858       <table class="memname">
 859         <tr>
 860           <td class="memname">int16_t __REVSH </td>
 861           <td>(</td>
 862           <td class="paramtype">int16_t&#160;</td>
 863           <td class="paramname"><em>value</em></td><td>)</td>
 864           <td></td>
 865         </tr>
 866       </table>
 867 </div><div class="memdoc">
 868
 869 <p>Reverse byte order (16 bit) </p>
 870 <p>Reverses the byte order in a 16-bit value and returns the signed 16-bit result. For example, 0x0080 becomes 0x8000. </p><dl class="params"><dt>Parameters</dt><dd>
 871   <table class="params">
 872     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to reverse </td></tr>
 873   </table>
 874   </dd>
 875 </dl>
 876 <dl class="section return"><dt>Returns</dt><dd>Reversed value </dd></dl>
 877
 878 </div>
 879 </div>
 880 <a id="gaf66beb577bb9d90424c3d1d7f684c024" name="gaf66beb577bb9d90424c3d1d7f684c024"></a>
 881 <h2 class="memtitle"><span class="permalink"><a href="#gaf66beb577bb9d90424c3d1d7f684c024">&#9670;&#160;</a></span>__ROR()</h2>
 882
 883 <div class="memitem">
 884 <div class="memproto">
 885       <table class="memname">
 886         <tr>
 887           <td class="memname">uint32_t __ROR </td>
 888           <td>(</td>
 889           <td class="paramtype">uint32_t&#160;</td>
 890           <td class="paramname"><em>value</em>, </td>
 891         </tr>
 892         <tr>
 893           <td class="paramkey"></td>
 894           <td></td>
 895           <td class="paramtype">uint32_t&#160;</td>
 896           <td class="paramname"><em>shift</em>&#160;</td>
 897         </tr>
 898         <tr>
 899           <td></td>
 900           <td>)</td>
 901           <td></td><td></td>
 902         </tr>
 903       </table>
 904 </div><div class="memdoc">
 905
 906 <p>Rotate a value right by a number of bits. </p>
 907 <p>This function rotates a value right by a specified number of bits.</p>
 908 <dl class="params"><dt>Parameters</dt><dd>
 909   <table class="params">
 910     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to be shifted right </td></tr>
 911     <tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>Number of bits in the range [1..31] </td></tr>
 912   </table>
 913   </dd>
 914 </dl>
 915 <dl class="section return"><dt>Returns</dt><dd>Rotated value </dd></dl>
 916
 917 </div>
 918 </div>
 919 <a id="gac09134f1bf9c49db07282001afcc9380" name="gac09134f1bf9c49db07282001afcc9380"></a>
 920 <h2 class="memtitle"><span class="permalink"><a href="#gac09134f1bf9c49db07282001afcc9380">&#9670;&#160;</a></span>__RRX()</h2>
 921
 922 <div class="memitem">
 923 <div class="memproto">
 924       <table class="memname">
 925         <tr>
 926           <td class="memname">uint32_t __RRX </td>
 927           <td>(</td>
 928           <td class="paramtype">uint32_t&#160;</td>
 929           <td class="paramname"><em>value</em></td><td>)</td>
 930           <td></td>
 931         </tr>
 932       </table>
 933 </div><div class="memdoc">
 934
 935 <p>Rotate Right with Extend (32 bit) </p>
 936 <p>This function moves each bit of a bitstring right by one bit. The carry input is shifted in at the left end of the bitstring.</p>
 937 <dl class="params"><dt>Parameters</dt><dd>
 938   <table class="params">
 939     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to rotate </td></tr>
 940   </table>
 941   </dd>
 942 </dl>
 943 <dl class="section return"><dt>Returns</dt><dd>Rotated value </dd></dl>
 944
 945 </div>
 946 </div>
 947 <a id="ga3c34da7eb16496ae2668a5b95fa441e7" name="ga3c34da7eb16496ae2668a5b95fa441e7"></a>
 948 <h2 class="memtitle"><span class="permalink"><a href="#ga3c34da7eb16496ae2668a5b95fa441e7">&#9670;&#160;</a></span>__SEV()</h2>
 949
 950 <div class="memitem">
 951 <div class="memproto">
 952       <table class="memname">
 953         <tr>
 954           <td class="memname">void __SEV </td>
 955           <td>(</td>
 956           <td class="paramtype">void&#160;</td>
 957           <td class="paramname"></td><td>)</td>
 958           <td></td>
 959         </tr>
 960       </table>
 961 </div><div class="memdoc">
 962
 963 <p>Send Event. </p>
 964 <p>Send Event is a hint instruction. It causes an event to be signaled to the CPU. </p>
 965
 966 </div>
 967 </div>
 968 <a id="ga8cfeb5ffe0e49ec6b29dafdde92e5118" name="ga8cfeb5ffe0e49ec6b29dafdde92e5118"></a>
 969 <h2 class="memtitle"><span class="permalink"><a href="#ga8cfeb5ffe0e49ec6b29dafdde92e5118">&#9670;&#160;</a></span>__SSAT()</h2>
 970
 971 <div class="memitem">
 972 <div class="memproto">
 973       <table class="memname">
 974         <tr>
 975           <td class="memname">int32_t __SSAT </td>
 976           <td>(</td>
 977           <td class="paramtype">int32_t&#160;</td>
 978           <td class="paramname"><em>value</em>, </td>
 979         </tr>
 980         <tr>
 981           <td class="paramkey"></td>
 982           <td></td>
 983           <td class="paramtype">uint32_t&#160;</td>
 984           <td class="paramname"><em>sat</em>&#160;</td>
 985         </tr>
 986         <tr>
 987           <td></td>
 988           <td>)</td>
 989           <td></td><td></td>
 990         </tr>
 991       </table>
 992 </div><div class="memdoc">
 993
 994 <p>Signed Saturate. </p>
 995 <p>This function saturates a signed value. The Q bit is set if saturation occurs [not for Cortex-M0, Cortex-M0+, or SC000].</p>
 996 <p>On Armv6-M (Cortex-M0, Cortex-M0+, and SC000) this function is not available as a core instruction instruction and thus __SSAT is implemented in software.</p>
 997 <dl class="params"><dt>Parameters</dt><dd>
 998   <table class="params">
 999     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to be saturated </td></tr>
1000     <tr><td class="paramdir">[in]</td><td class="paramname">sat</td><td>Bit position to saturate to [1..32] </td></tr>
1001   </table>
1002   </dd>
1003 </dl>
1004 <dl class="section return"><dt>Returns</dt><dd>Saturated value </dd></dl>
1005
1006 </div>
1007 </div>
1008 <a id="ga5429d7083fb8d30c43cecd3a861e1672" name="ga5429d7083fb8d30c43cecd3a861e1672"></a>
1009 <h2 class="memtitle"><span class="permalink"><a href="#ga5429d7083fb8d30c43cecd3a861e1672">&#9670;&#160;</a></span>__STL()</h2>
1010
1011 <div class="memitem">
1012 <div class="memproto">
1013       <table class="memname">
1014         <tr>
1015           <td class="memname">void __STL </td>
1016           <td>(</td>
1017           <td class="paramtype">uint32_t&#160;</td>
1018           <td class="paramname"><em>value</em>, </td>
1019         </tr>
1020         <tr>
1021           <td class="paramkey"></td>
1022           <td></td>
1023           <td class="paramtype">volatile uint32_t *&#160;</td>
1024           <td class="paramname"><em>ptr</em>&#160;</td>
1025         </tr>
1026         <tr>
1027           <td></td>
1028           <td>)</td>
1029           <td></td><td></td>
1030         </tr>
1031       </table>
1032 </div><div class="memdoc">
1033
1034 <p>Store-Release (32 bit) </p>
1035 <p>Executes a STL instruction for 32 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1036   <table class="params">
1037     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1038     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1039   </table>
1040   </dd>
1041 </dl>
1042 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1043
1044 </div>
1045 </div>
1046 <a id="gace025d3a1f85d2ab9bae7288838d6bc8" name="gace025d3a1f85d2ab9bae7288838d6bc8"></a>
1047 <h2 class="memtitle"><span class="permalink"><a href="#gace025d3a1f85d2ab9bae7288838d6bc8">&#9670;&#160;</a></span>__STLB()</h2>
1048
1049 <div class="memitem">
1050 <div class="memproto">
1051       <table class="memname">
1052         <tr>
1053           <td class="memname">void __STLB </td>
1054           <td>(</td>
1055           <td class="paramtype">uint8_t&#160;</td>
1056           <td class="paramname"><em>value</em>, </td>
1057         </tr>
1058         <tr>
1059           <td class="paramkey"></td>
1060           <td></td>
1061           <td class="paramtype">volatile uint8_t *&#160;</td>
1062           <td class="paramname"><em>ptr</em>&#160;</td>
1063         </tr>
1064         <tr>
1065           <td></td>
1066           <td>)</td>
1067           <td></td><td></td>
1068         </tr>
1069       </table>
1070 </div><div class="memdoc">
1071
1072 <p>Store-Release (8 bit) </p>
1073 <p>Executes a STLB instruction for 8 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1074   <table class="params">
1075     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1076     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1077   </table>
1078   </dd>
1079 </dl>
1080 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1081
1082 </div>
1083 </div>
1084 <a id="gae7f955b91595cfd82a03e4b437c59afe" name="gae7f955b91595cfd82a03e4b437c59afe"></a>
1085 <h2 class="memtitle"><span class="permalink"><a href="#gae7f955b91595cfd82a03e4b437c59afe">&#9670;&#160;</a></span>__STLEX()</h2>
1086
1087 <div class="memitem">
1088 <div class="memproto">
1089       <table class="memname">
1090         <tr>
1091           <td class="memname">uint32_t __STLEX </td>
1092           <td>(</td>
1093           <td class="paramtype">uint32_t&#160;</td>
1094           <td class="paramname"><em>value</em>, </td>
1095         </tr>
1096         <tr>
1097           <td class="paramkey"></td>
1098           <td></td>
1099           <td class="paramtype">volatile uint32_t *&#160;</td>
1100           <td class="paramname"><em>ptr</em>&#160;</td>
1101         </tr>
1102         <tr>
1103           <td></td>
1104           <td>)</td>
1105           <td></td><td></td>
1106         </tr>
1107       </table>
1108 </div><div class="memdoc">
1109
1110 <p>Store-Release Exclusive (32 bit) </p>
1111 <p>Executes a STL exclusive instruction for 32 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1112   <table class="params">
1113     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1114     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1115   </table>
1116   </dd>
1117 </dl>
1118 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1119 <dd>
1120 1 Function failed </dd></dl>
1121 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1122
1123 </div>
1124 </div>
1125 <a id="ga590724a32a229978536fbbbd6cc82536" name="ga590724a32a229978536fbbbd6cc82536"></a>
1126 <h2 class="memtitle"><span class="permalink"><a href="#ga590724a32a229978536fbbbd6cc82536">&#9670;&#160;</a></span>__STLEXB()</h2>
1127
1128 <div class="memitem">
1129 <div class="memproto">
1130       <table class="memname">
1131         <tr>
1132           <td class="memname">uint32_t __STLEXB </td>
1133           <td>(</td>
1134           <td class="paramtype">uint8_t&#160;</td>
1135           <td class="paramname"><em>value</em>, </td>
1136         </tr>
1137         <tr>
1138           <td class="paramkey"></td>
1139           <td></td>
1140           <td class="paramtype">volatile uint8_t *&#160;</td>
1141           <td class="paramname"><em>ptr</em>&#160;</td>
1142         </tr>
1143         <tr>
1144           <td></td>
1145           <td>)</td>
1146           <td></td><td></td>
1147         </tr>
1148       </table>
1149 </div><div class="memdoc">
1150
1151 <p>Store-Release Exclusive (8 bit) </p>
1152 <p>Executes a STLB exclusive instruction for 8 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1153   <table class="params">
1154     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1155     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1156   </table>
1157   </dd>
1158 </dl>
1159 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1160 <dd>
1161 1 Function failed </dd></dl>
1162 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1163
1164 </div>
1165 </div>
1166 <a id="ga047c3bebca3d0ae348ab8370a046301d" name="ga047c3bebca3d0ae348ab8370a046301d"></a>
1167 <h2 class="memtitle"><span class="permalink"><a href="#ga047c3bebca3d0ae348ab8370a046301d">&#9670;&#160;</a></span>__STLEXH()</h2>
1168
1169 <div class="memitem">
1170 <div class="memproto">
1171       <table class="memname">
1172         <tr>
1173           <td class="memname">uint32_t __STLEXH </td>
1174           <td>(</td>
1175           <td class="paramtype">uint16_t&#160;</td>
1176           <td class="paramname"><em>value</em>, </td>
1177         </tr>
1178         <tr>
1179           <td class="paramkey"></td>
1180           <td></td>
1181           <td class="paramtype">volatile uint16_t *&#160;</td>
1182           <td class="paramname"><em>ptr</em>&#160;</td>
1183         </tr>
1184         <tr>
1185           <td></td>
1186           <td>)</td>
1187           <td></td><td></td>
1188         </tr>
1189       </table>
1190 </div><div class="memdoc">
1191
1192 <p>Store-Release Exclusive (16 bit) </p>
1193 <p>Executes a STLH exclusive instruction for 16 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1194   <table class="params">
1195     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1196     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1197   </table>
1198   </dd>
1199 </dl>
1200 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1201 <dd>
1202 1 Function failed </dd></dl>
1203 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1204
1205 </div>
1206 </div>
1207 <a id="ga25691650de536f9b248b15f6dc4a3e70" name="ga25691650de536f9b248b15f6dc4a3e70"></a>
1208 <h2 class="memtitle"><span class="permalink"><a href="#ga25691650de536f9b248b15f6dc4a3e70">&#9670;&#160;</a></span>__STLH()</h2>
1209
1210 <div class="memitem">
1211 <div class="memproto">
1212       <table class="memname">
1213         <tr>
1214           <td class="memname">void __STLH </td>
1215           <td>(</td>
1216           <td class="paramtype">uint16_t&#160;</td>
1217           <td class="paramname"><em>value</em>, </td>
1218         </tr>
1219         <tr>
1220           <td class="paramkey"></td>
1221           <td></td>
1222           <td class="paramtype">volatile uint16_t *&#160;</td>
1223           <td class="paramname"><em>ptr</em>&#160;</td>
1224         </tr>
1225         <tr>
1226           <td></td>
1227           <td>)</td>
1228           <td></td><td></td>
1229         </tr>
1230       </table>
1231 </div><div class="memdoc">
1232
1233 <p>Store-Release (16 bit) </p>
1234 <p>Executes a STLH instruction for 16 bit values. </p><dl class="params"><dt>Parameters</dt><dd>
1235   <table class="params">
1236     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1237     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1238   </table>
1239   </dd>
1240 </dl>
1241 <dl class="section note"><dt>Note</dt><dd>Only available for Armv8-M Architecture. </dd></dl>
1242
1243 </div>
1244 </div>
1245 <a id="gad41aa59c92c0a165b7f98428d3320cd5" name="gad41aa59c92c0a165b7f98428d3320cd5"></a>
1246 <h2 class="memtitle"><span class="permalink"><a href="#gad41aa59c92c0a165b7f98428d3320cd5">&#9670;&#160;</a></span>__STRBT()</h2>
1247
1248 <div class="memitem">
1249 <div class="memproto">
1250       <table class="memname">
1251         <tr>
1252           <td class="memname">void __STRBT </td>
1253           <td>(</td>
1254           <td class="paramtype">uint8_t&#160;</td>
1255           <td class="paramname"><em>value</em>, </td>
1256         </tr>
1257         <tr>
1258           <td class="paramkey"></td>
1259           <td></td>
1260           <td class="paramtype">uint8_t&#160;</td>
1261           <td class="paramname"><em>ptr</em>&#160;</td>
1262         </tr>
1263         <tr>
1264           <td></td>
1265           <td>)</td>
1266           <td></td><td></td>
1267         </tr>
1268       </table>
1269 </div><div class="memdoc">
1270
1271 <p>STRT Unprivileged (8 bit) </p>
1272 <p>This function executed an Unprivileged STRT command for 8 bit values.</p>
1273 <dl class="params"><dt>Parameters</dt><dd>
1274   <table class="params">
1275     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1276     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1277   </table>
1278   </dd>
1279 </dl>
1280
1281 </div>
1282 </div>
1283 <a id="gaab6482d1f59f59e2b6b7efc1af391c99" name="gaab6482d1f59f59e2b6b7efc1af391c99"></a>
1284 <h2 class="memtitle"><span class="permalink"><a href="#gaab6482d1f59f59e2b6b7efc1af391c99">&#9670;&#160;</a></span>__STREXB()</h2>
1285
1286 <div class="memitem">
1287 <div class="memproto">
1288       <table class="memname">
1289         <tr>
1290           <td class="memname">uint32_t __STREXB </td>
1291           <td>(</td>
1292           <td class="paramtype">uint8_t&#160;</td>
1293           <td class="paramname"><em>value</em>, </td>
1294         </tr>
1295         <tr>
1296           <td class="paramkey"></td>
1297           <td></td>
1298           <td class="paramtype">volatile uint8_t *&#160;</td>
1299           <td class="paramname"><em>addr</em>&#160;</td>
1300         </tr>
1301         <tr>
1302           <td></td>
1303           <td>)</td>
1304           <td></td><td></td>
1305         </tr>
1306       </table>
1307 </div><div class="memdoc">
1308
1309 <p>STR Exclusive (8 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
1310 <p>This function executed an exclusive STR command for 8 bit values [not for Cortex-M0, Cortex-M0+, or SC000].</p>
1311 <dl class="params"><dt>Parameters</dt><dd>
1312   <table class="params">
1313     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1314     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to location </td></tr>
1315   </table>
1316   </dd>
1317 </dl>
1318 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1319 <dd>
1320 1 Function failed </dd></dl>
1321
1322 </div>
1323 </div>
1324 <a id="ga0a354bdf71caa52f081a4a54e84c8d2a" name="ga0a354bdf71caa52f081a4a54e84c8d2a"></a>
1325 <h2 class="memtitle"><span class="permalink"><a href="#ga0a354bdf71caa52f081a4a54e84c8d2a">&#9670;&#160;</a></span>__STREXH()</h2>
1326
1327 <div class="memitem">
1328 <div class="memproto">
1329       <table class="memname">
1330         <tr>
1331           <td class="memname">uint32_t __STREXH </td>
1332           <td>(</td>
1333           <td class="paramtype">uint16_t&#160;</td>
1334           <td class="paramname"><em>value</em>, </td>
1335         </tr>
1336         <tr>
1337           <td class="paramkey"></td>
1338           <td></td>
1339           <td class="paramtype">volatile uint16_t *&#160;</td>
1340           <td class="paramname"><em>addr</em>&#160;</td>
1341         </tr>
1342         <tr>
1343           <td></td>
1344           <td>)</td>
1345           <td></td><td></td>
1346         </tr>
1347       </table>
1348 </div><div class="memdoc">
1349
1350 <p>STR Exclusive (16 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
1351 <p>This function executed an exclusive STR command for 16 bit values [not for Cortex-M0, Cortex-M0+, or SC000].</p>
1352 <dl class="params"><dt>Parameters</dt><dd>
1353   <table class="params">
1354     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1355     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to location </td></tr>
1356   </table>
1357   </dd>
1358 </dl>
1359 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1360 <dd>
1361 1 Function failed </dd></dl>
1362
1363 </div>
1364 </div>
1365 <a id="ga335deaaa7991490e1450cb7d1e4c5197" name="ga335deaaa7991490e1450cb7d1e4c5197"></a>
1366 <h2 class="memtitle"><span class="permalink"><a href="#ga335deaaa7991490e1450cb7d1e4c5197">&#9670;&#160;</a></span>__STREXW()</h2>
1367
1368 <div class="memitem">
1369 <div class="memproto">
1370       <table class="memname">
1371         <tr>
1372           <td class="memname">uint32_t __STREXW </td>
1373           <td>(</td>
1374           <td class="paramtype">uint32_t&#160;</td>
1375           <td class="paramname"><em>value</em>, </td>
1376         </tr>
1377         <tr>
1378           <td class="paramkey"></td>
1379           <td></td>
1380           <td class="paramtype">volatile uint32_t *&#160;</td>
1381           <td class="paramname"><em>addr</em>&#160;</td>
1382         </tr>
1383         <tr>
1384           <td></td>
1385           <td>)</td>
1386           <td></td><td></td>
1387         </tr>
1388       </table>
1389 </div><div class="memdoc">
1390
1391 <p>STR Exclusive (32 bit) [not for Cortex-M0, Cortex-M0+, or SC000]. </p>
1392 <p>This function executed an exclusive STR command for 32 bit values [not for Cortex-M0, Cortex-M0+, or SC000].</p>
1393 <dl class="params"><dt>Parameters</dt><dd>
1394   <table class="params">
1395     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1396     <tr><td class="paramdir">[in]</td><td class="paramname">*addr</td><td>Pointer to location </td></tr>
1397   </table>
1398   </dd>
1399 </dl>
1400 <dl class="section return"><dt>Returns</dt><dd>0 Function succeeded </dd>
1401 <dd>
1402 1 Function failed </dd></dl>
1403
1404 </div>
1405 </div>
1406 <a id="ga2b5d93b8e461755b1072a03df3f1722e" name="ga2b5d93b8e461755b1072a03df3f1722e"></a>
1407 <h2 class="memtitle"><span class="permalink"><a href="#ga2b5d93b8e461755b1072a03df3f1722e">&#9670;&#160;</a></span>__STRHT()</h2>
1408
1409 <div class="memitem">
1410 <div class="memproto">
1411       <table class="memname">
1412         <tr>
1413           <td class="memname">void __STRHT </td>
1414           <td>(</td>
1415           <td class="paramtype">uint16_t&#160;</td>
1416           <td class="paramname"><em>value</em>, </td>
1417         </tr>
1418         <tr>
1419           <td class="paramkey"></td>
1420           <td></td>
1421           <td class="paramtype">uint16_t&#160;</td>
1422           <td class="paramname"><em>ptr</em>&#160;</td>
1423         </tr>
1424         <tr>
1425           <td></td>
1426           <td>)</td>
1427           <td></td><td></td>
1428         </tr>
1429       </table>
1430 </div><div class="memdoc">
1431
1432 <p>STRT Unprivileged (16 bit) </p>
1433 <p>This function executed an Unprivileged STRT command for 16 bit values.</p>
1434 <dl class="params"><dt>Parameters</dt><dd>
1435   <table class="params">
1436     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1437     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1438   </table>
1439   </dd>
1440 </dl>
1441
1442 </div>
1443 </div>
1444 <a id="ga625bc4ac0b1d50de9bcd13d9f050030e" name="ga625bc4ac0b1d50de9bcd13d9f050030e"></a>
1445 <h2 class="memtitle"><span class="permalink"><a href="#ga625bc4ac0b1d50de9bcd13d9f050030e">&#9670;&#160;</a></span>__STRT()</h2>
1446
1447 <div class="memitem">
1448 <div class="memproto">
1449       <table class="memname">
1450         <tr>
1451           <td class="memname">void __STRT </td>
1452           <td>(</td>
1453           <td class="paramtype">uint32_t&#160;</td>
1454           <td class="paramname"><em>value</em>, </td>
1455         </tr>
1456         <tr>
1457           <td class="paramkey"></td>
1458           <td></td>
1459           <td class="paramtype">uint32_t&#160;</td>
1460           <td class="paramname"><em>ptr</em>&#160;</td>
1461         </tr>
1462         <tr>
1463           <td></td>
1464           <td>)</td>
1465           <td></td><td></td>
1466         </tr>
1467       </table>
1468 </div><div class="memdoc">
1469
1470 <p>STRT Unprivileged (32 bit) </p>
1471 <p>This function executed an Unprivileged STRT command for 32 bit values.</p>
1472 <dl class="params"><dt>Parameters</dt><dd>
1473   <table class="params">
1474     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to store </td></tr>
1475     <tr><td class="paramdir">[in]</td><td class="paramname">ptr</td><td>Pointer to location </td></tr>
1476   </table>
1477   </dd>
1478 </dl>
1479
1480 </div>
1481 </div>
1482 <a id="ga9ba87371aebd17dd6244ed3458b29b5d" name="ga9ba87371aebd17dd6244ed3458b29b5d"></a>
1483 <h2 class="memtitle"><span class="permalink"><a href="#ga9ba87371aebd17dd6244ed3458b29b5d">&#9670;&#160;</a></span>__USAT()</h2>
1484
1485 <div class="memitem">
1486 <div class="memproto">
1487       <table class="memname">
1488         <tr>
1489           <td class="memname">uint32_t __USAT </td>
1490           <td>(</td>
1491           <td class="paramtype">int32_t&#160;</td>
1492           <td class="paramname"><em>value</em>, </td>
1493         </tr>
1494         <tr>
1495           <td class="paramkey"></td>
1496           <td></td>
1497           <td class="paramtype">uint32_t&#160;</td>
1498           <td class="paramname"><em>sat</em>&#160;</td>
1499         </tr>
1500         <tr>
1501           <td></td>
1502           <td>)</td>
1503           <td></td><td></td>
1504         </tr>
1505       </table>
1506 </div><div class="memdoc">
1507
1508 <p>Unsigned Saturate. </p>
1509 <p>This function saturates an unsigned value. The Q bit is set if saturation occurs [not for Cortex-M0, Cortex-M0+, or SC000].</p>
1510 <p>On Armv6-M (Cortex-M0, Cortex-M0+, and SC000) this function is not available as a core instruction instruction and thus __USAT is implemented in software.</p>
1511 <dl class="params"><dt>Parameters</dt><dd>
1512   <table class="params">
1513     <tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>Value to be saturated </td></tr>
1514     <tr><td class="paramdir">[in]</td><td class="paramname">sat</td><td>Bit position to saturate to [0..31] </td></tr>
1515   </table>
1516   </dd>
1517 </dl>
1518 <dl class="section return"><dt>Returns</dt><dd>Saturated value </dd></dl>
1519
1520 </div>
1521 </div>
1522 <a id="gad3efec76c3bfa2b8528ded530386c563" name="gad3efec76c3bfa2b8528ded530386c563"></a>
1523 <h2 class="memtitle"><span class="permalink"><a href="#gad3efec76c3bfa2b8528ded530386c563">&#9670;&#160;</a></span>__WFE()</h2>
1524
1525 <div class="memitem">
1526 <div class="memproto">
1527       <table class="memname">
1528         <tr>
1529           <td class="memname">void __WFE </td>
1530           <td>(</td>
1531           <td class="paramtype">void&#160;</td>
1532           <td class="paramname"></td><td>)</td>
1533           <td></td>
1534         </tr>
1535       </table>
1536 </div><div class="memdoc">
1537
1538 <p>Wait For Event. </p>
1539 <p>Wait For Event is a hint instruction that permits the processor to enter a low-power state until an events occurs: </p><ul>
1540 <li>If the <b>event register is 0</b>, then WFE suspends execution until one of the following events occurs:<ul>
1541 <li>An exception, unless masked by the exception mask registers or the current priority level.</li>
1542 <li>An exception enters the Pending state, if SEVONPEND in the System Control Register is set.</li>
1543 <li>A Debug Entry request, if Debug is enabled.</li>
1544 <li>An event signaled by a peripheral or another processor in a multiprocessor system using the SEV instruction.</li>
1545 </ul>
1546 </li>
1547 </ul>
1548 <ul>
1549 <li>If the <b>event register is 1</b>, then WFE clears it to 0 and returns immediately. </li>
1550 </ul>
1551
1552 </div>
1553 </div>
1554 <a id="gaed91dfbf3d7d7b7fba8d912fcbeaad88" name="gaed91dfbf3d7d7b7fba8d912fcbeaad88"></a>
1555 <h2 class="memtitle"><span class="permalink"><a href="#gaed91dfbf3d7d7b7fba8d912fcbeaad88">&#9670;&#160;</a></span>__WFI()</h2>
1556
1557 <div class="memitem">
1558 <div class="memproto">
1559       <table class="memname">
1560         <tr>
1561           <td class="memname">void __WFI </td>
1562           <td>(</td>
1563           <td class="paramtype">void&#160;</td>
1564           <td class="paramname"></td><td>)</td>
1565           <td></td>
1566         </tr>
1567       </table>
1568 </div><div class="memdoc">
1569
1570 <p>Wait For Interrupt. </p>
1571 <p>WFI is a hint instruction that suspends execution until one of the following events occurs:</p><ul>
1572 <li>A non-masked interrupt occurs and is taken.</li>
1573 <li>An interrupt masked by PRIMASK becomes pending.</li>
1574 <li>A Debug Entry request. </li>
1575 </ul>
1576
1577 </div>
1578 </div>
1579 </div><!-- contents -->
1580 </div><!-- doc-content -->
1581 <!-- start footer part -->
1582 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
1583   <ul>
1584     <li class="footer">
1585       <script type="text/javascript">
1586         <!--
1587         writeFooter.call(this);
1588         //-->
1589       </script>
1590     </li>
1591   </ul>
1592 </div>
1593 </body>
1594 </html>