题目内容

使用线选法对8051系统进行扩展时,不需要地址译码器,减少体积,降低成本,但可寻址的器件数目受到很大限制,且地址空间不连续。( )

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8051使用指令MOVX A,@R0读外部数据存储器时,不起作用的信号是()

A. /RD
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