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[单选题]
8255A有信号组合：A1=0,A0=0,/RD=0,/WR=1,/CS=0,则代表（）
A
A口内容读至数据总线b.数据总线内容写至A口c.数据总线内容写至控制寄存器d.B口内容读至数据总线
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试题答案：
A
答案解释：
A1=0,A0=0表示对A口操作，/RD=0,/WR=1,/CS=0表示对8255A进行读操作。
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