问题
单项选择题
已知(SP)=40H，片内RAM(60H)=0FH，执行PUSH 60H和POP 50H两条指令后，SP及50H中内容各为 ( )
A．(SP)=39H，(50H)=23H
B．(SP)=40H，(50H)=0FH
C．(SP)=41H，(50H)=0FH
D．(SP)=40H，(50H)=60H
答案
参考答案：B
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已知(SP)=40H，片内RAM(60H)=0FH，执行PUSH 60H和POP 50H两条指令后，SP及50H中内容各为 ( )
A．(SP)=39H，(50H)=23H
B．(SP)=40H，(50H)=0FH
C．(SP)=41H，(50H)=0FH
D．(SP)=40H，(50H)=60H
参考答案：B