题目内容

Instruction “MOV A, @R1” will ( )

A. copy R1 to the accumulator
B. copy the accumulator to R1
C. copy the contents of internal RAM pointed by R1 to accumulator
D. copy the contents of external RAM pointed by R1 to accumulator

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更多问题

Which of the following instruction will move the number 27H in the accumulator? ( )

A. MOV A, 27
B. MOV A, #27H
C. MOV A, 27H
D. MOV A, @27

Which of the following is invalid instruction? ( )

A. MOVX R0, @DPTR
B. MOVC A, @A+PC
C. XCH A, 10H
D. XCH A, @R1

Which of the following instructions is an example for the direct addressing mode? ( )

A. MOV A, @R0
B. MOV R0, #10H
C. MOV 10H, A
D. MOV R5, A

Addition instruction of the 8051 can affect, ( )

A. carry flag
B. auxiliary carry flag
C. overflow flag
D. parity flag