问题标题:
假定A=83H,R0=17H,(17H)=34H,执行以下指令:ANLA,#17HORL17H,AXRLA,@R0A怎么会等于34H?帮我分析一下,
问题描述:
假定A=83H,R0=17H,(17H)=34H,执行以下指令:ANLA,#17HORL17H,AXRLA,@R0A怎么会等于34H?帮我分析一下,
史俊回答:
ANLA,#17H;A中83H与17H相与,(A)=03H
ORL17H,A;(17H)中34H与(A)中03H相或,(17H)=37H
XRLA,@R0A;(A)中03H与(17H)中37H异或,(A)=34H
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