item expanded "><a href="../../chapter_5/5.2/5.2.3.html"><strong aria-hidden="true">5.2.3.</strong> SPI Flash</a></li><li class="chapter-item expanded "><a href="../../chapter_5/5.2/5.2.4.html"><strong aria-hidden="true">5.2.4.</strong> Clock Source</a></li><li class="chapter-item expanded "><a href="../../chapter_5/5.2/5.2.5.html"><strong aria-hidden="true">5.2.5.</strong> RF and Antenna</a></li><li class="chapter-item expanded "><a href="../../chapter_5/5.2/5.2.6.html"><strong aria-hidden="true">5.2.6.</s