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于 2011-11-08 发布
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代码说明：
用PWM方波调节LED亮度P1.1控制LED，低电平点亮K3和K4分别接在P3.4、P3.5，按下时为低电平按K3可调暗LED，按K4可调亮LED(PWM square wave with adjustable LED brightness control P1.1 LED, low light K3 and K4 are connected to the P3.4, P3.5, when pressed by K3 adjustable low dark LED, adjustable by K4 LED light)
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