Multivibrators and 555 Timer - General Questions (4)

Directions to Solve

Multivibrators and 555 Timer - General Questions

25. 

Data transfer from I/O to external data memory can only be done with the MOV command.
A. True
B. False

Answer: Option B

Explanation:

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26. 

Which of the following statements will add the accumulator and register 3?
A. ADD @R3, @A
B. ADD @A, R3
C. ADD R3, A
D. ADD A, R3

Answer: Option D

Explanation:

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27. 

Which of the following instructions will move the contents of register 3 to the accumulator?
A. MOV 3R, A
B. MOV R3, A
C. MOV A, R3
D. MOV A, 3R

Answer: Option C

Explanation:

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28. 

This program code will be executed once:

STAT: MOV A, #01H
  JNZ STAT
A. True
B. False

Answer: Option B

Explanation:

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29. 

The start-conversion on the ADC0804 is done by using the:
A. mca18_1052a1
B. CS line
C. INTR line
D. V ref/2 line

Answer: Option A

Explanation:

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30. 

The contents of the accumulator after this operation
MOV A,#0BH
ANL A,#2CH
will be
A. 11010111
B. 11011010
C. 00001000
D. 00101000

Answer: Option C

Explanation:

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31. 

The 8-bit address bus allows access to an address range of:
A. 0000 to FFFFH
B. 000 to FFFH
C. 00 to FFH
D. 0 to FH

Answer: Option C

Explanation:

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32. 

Bit-addressable memory locations are:
A. 10H through 1FH
B. 20H through 2FH
C. 30H through 3FH
D. 40H through 4FH

Answer: Option B

Explanation:

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