文件名称:jiaotongdeng
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用8255A的B端口和C端口控制12个LED发光二极管的亮和灭，以模拟交通路灯的管理。
-With the 8255A, B and C port control port 12 of the light emitting diode LED and off to simulate the management of traffic lights.
-With the 8255A, B and C port control port 12 of the light emitting diode LED and off to simulate the management of traffic lights.
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交通灯.doc