单片机原理及应用已知(A)=7A,(R0)=30H,(30H)=A5H,(PSW)=80H,请写出下列各条指令执行后A中的内容（假设（cy）=0):(1)XCHA,R0(2)XCHA,30H(3)XCHA,@R0(4)XCHDA,@R0(5)SWAPA(6)ADDA,R0(7)ADDA,30H(8)ADDA,#30H(9)ADDCA,30H(10)SUBB

Question

单片机原理及应用
已知(A)=7A,(R0)=30H,(30H)=A5H,(PSW)=80H,请写出下列各条指令执行后A中的内容（假设（cy）=0):
(1)XCH A,R0
(2)XCH A,30H
(3)XCH A,@R0
(4)XCHD A,@R0
(5)SWAP A
(6)ADD A,R0
(7)ADD A,30H
(8)ADD A,#30H
(9)ADDC A,30H
(10)SUBB A,30H
(11)SUBB A,#30H
(12)ANL A,@R0

Answer 1

(1)30H
(2)A5H
(3)A5H
(4)75H
(5)A7H
(6)AAH
(7)1FH
(8)AAH
(9)20H
(10)D5H
(11)4AH
(12)20H
什么叫假设Cy=0
PSW=80H好像就是Cy=1了吧
PSW的第7位就是Cy吧