题目：
微处理器对I/O口的编址方式有两种。一种是将I/O口地址和存储器地址统一编址，把I/O口地址看作存储器地址的一部分，用存储器访问指令实现输入输出；另一种是将I/O口地址和存储器地址分别独立编址，采用专门的 【 】 指令对I/O口进行操作。
答案：
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参考答案：A
微处理器对I/O口的编址方式有两种。一种是将I/O口地址和存储器地址统一编址，把I/
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