text of &lt;o key-identifier&gt;! The <em><b>identifier</b></em> corresponding to the selected text replaces the identifier following the key-identifier specified by the &lt;o ...&gt; tag. <div class="fragment"><div class="line"><span class="comment">//   &lt;o TIMESTAMP_SRC&gt;Time Stamp Source</span></div>
<div class="line"><span class="comment">//      &lt;dwt=&gt;     DWT Cycle Counter</span></div>
<div class="line"><span class="comment">//      &lt;systick=&gt; SysTick</span></div>
<div class="line"><s