analog reference (high two bits of ADMUX) and select the</span></div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="comment">// channel (low 4 bits).  this also sets ADLAR (left-adjust result)</span></div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="comment">// to 0 (the default).</span></div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="preprocessor">#</span><span class="pr