A 30H B. OFH C. O9H D. 3FH 20. Which of the following intermupts cannot be ignor

Question

A 30H B. OFH C. O9H D. 3FH 20. Which of the following intermupts cannot be ignored by the CPU? A Timer B Serial C. Reset D. Serial communication 21. A subroutine called from within another subroutine is referred to as a A caged subroutine B. secondary subroutine C. stacked subroutine D. nested subroutine 22. Executing the instruction MOV P1, A cause's A the data in A to be sent out port P1 for a brief timer interval B. the value contained in A to be sent out port P1 and latched C. register A to be set to the value contained in port P1 D. the value in port P1 to be set to the constant A 23. What is the final result in the accumulator ater the execution of the following progra ANL A, #0FH CPL A A 55H B. FAH C. AAH D. 35H 24. Which of the following is always bi-directiona? A. The enable line B. The address bus C. The data bus D. The control bus 25. What is the final result of the P1 port aher the execution of the folliowing program se MOV A, BOFFH MOV P1, A A 8BH

Explanation / Answer

20)
Ans: serial communication.
Among all serial communication can not be increased by cpu.

21)
Ans: d)nested subroutine.
Subroutine in another subroutine is called a snested subroutine.

22)
Ans: b) The value contained in A to be sent out port P1 and latched.

23)
Ans: A)55H

24)Ans: C) The data bus.

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