题目内容

For a given crystal frequency, minimum time delay generated by Timer 0 is in ()

A. Mode 0
B. Mode 1
C. Mode 2

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All 8051 SFRs are bit-addressable. ( )

After execution of following two instructions “MOV A, #55H” and “ORL A, #01H”, the contents of the accumulator will be ( ).

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

For signed operations, -1 is represented in binary as ( ).

A. 10000001B
B. 01111111B
C. 10000000B
D. 11111111B

MOV 10H, 20H is a ( )-byte instruction.

A. 1
B. 2
C. 3
D. 4