<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <span class="comment">// the MUX5 bit of ADCSRB selects whether we&#39;re reading from channels</span></div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="comment">// 0 to 7 (MUX5 low) or 8 to 15 (MUX5 high).</span></div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    ADCSRB = (ADCSRB &amp; ~(1 &lt;&lt; MUX5)) | (((channel &gt;&gt; 3) &amp; 0x01)