【单选题】【消耗次数：1】
8051单片机的P2口除作为输入／输出接口使用外，还可以作为____使用。
①
低8位地址总线
②
高8位地址总线
③
数据总线
④
控制总线
参考答案：
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【简答题】
系统总线包括地址总线、数据总线和控制总线，其中在地址总线上信息传输是[填空1]向的。
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