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變址寄存器有什么作用?

發布日期:2022-04-27 點擊率:549

    FX系列用FOR和NEXT指令設計循環處理程序時,一般用變址寄存器來修改操作數的地址。

    三菱的FXis和FXIN系列有兩個變址寄存器V和Z,FX2N和FX2NC有16個變址寄存器VO - V7和Z0 - 27,在32位操作時將V、Z合并使用,Z為低位。變址寄存器用來改變編程元件的元件號,例如數據寄存器的元件號(即地址)為D6V時,6是基本地址,V中的數據是可變的地址部分。當V中的數據為12時,D6V相當于D18  (12+6 =18)。通過修改變址寄存器的值,就可以改變數據寄存器的元件號.

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