题目内容

Addition instruction of the 8051 can affect ( )

A. CY flag
B. CY and AC flags
CY, AC, and OV flags
D. CY, AC, OV, and P flags

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Which of the following instruction will move the value of port 3 to the register R2? ( )

A. MOV P2, R3
B. MOV R3, P2
C. MOV P3, R2
D. MOV R2, P3

Which of the following instruction will copy the contents of RAM whose address is in register R0 to port 3? ( )

A. MOV @P3, R0
B. MOV @R0, P3
C. MOV P3, @R0
D. MOV P3, R0

PUSH/POP instructions support only ( )addressing mode.

A. register
B. immediate
C. direct
D. register indirect

Instruction “MOVX A, @DPTR” is a valid 8051 instruction. ( )