题目内容

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

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Addition instruction of the 8051 can affect, ( )

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

The contents of the accumulator after execution of following instructions will be( ) MOV A, #0FH ANL A, #2CH

A. 11010111B
B. 11011010B
C. 00001100B
D. 00101000B

To mask the LSB of the A, we must AND it with( )

A. 7FH
B. 80H
C. FEH
D. FFH

The instructions that copy data from register R0 to register R5 when register bank 0 is active is ( )

A. MOV R5, R0
B. MOV 05H, 00H