设累加器A的内容为0 C 9 H，寄存器R2的内容为54H，C Y=1，执行指令S U B B A， R2 后结果为（） - 查题网

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成人高等教育 / 单片机原理及应用

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设累加器A的内容为0 C 9 H，寄存器R2的内容为54H，C Y=1，执行指令S U B B A，
R2 后结果为（）

A、
（A）=74H
B、
（R2）=74H
C、
（A）=75H
D、
（R2）=75H

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单片机原理及应用

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