描述
在程序的每次扫描中，模拟电位器0的值，通过特殊存储字节SMB28被拷贝到内存字MW0的低字节MB1。电位器的值除以8作为脉宽，脉宽和脉冲周期的比率大致决定了灯炮的亮度(相对于最大亮度)。除以8会带来这样一个额外的好处，即丢弃了SMB28所存值的3个最低有效位，从而使程序更稳定。如果电位器值变化了，那么将重新初始化输出端Q0.0的脉宽调制，借此电位器的新值将被变换成脉宽的毫秒值。
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