题目内容

The 8051 does not have bit-level instructions for ( )

AND
B. OR
C. complement
D. Exclusive OR (XOR)

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Which of the following instruction is invalid? ( )

A. SETB C
B. SETB B
C. ANL C, 00H
D. MOV C, 10H

To complement the A, we must XOR it with( )

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

To set MSB of the A to 1, we must OR it with( )

A. 00H
B. 01H
C. 80H
D. FFH

The contents of the accumulator after execution of following instructions will be( ) MOV A, #55H ORL A, #01H

A. 1BH
B. 55H
C. 3BH
D. 4BH