The 8051 Microcontroller - General Questions (6)

Directions to Solve

The 8051 Microcontroller - General Questions

41. 
 

The following program will receive data from port 1, determine whether bit 2 is high, and then send the number FFH to port 3:
READ: MOV A,P1
ANL A,#2H
CJNE A,#02H,READ
MOV P3,#FFH
A. True
B. False

Answer: Option A

Explanation:

No answer description available for this question

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42. 

A label is used to name a single line of code.
A. True
B. False

Answer: Option A

Explanation:

No answer description available for this question

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43. 

MOV A, @ R1 will:
A. copy R1 to the accumulator
B. copy the accumulator to R1
C. copy the contents of memory whose address is in R1 to the accumulator
D. copy the accumulator to the contents of memory whose address is in R1

Answer: Option C

Explanation:

No answer description available for this question

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44. 

This statement will set the address of the bit to 1 (8051 Micro-controller):
SETB 01H
A. True
B. False

Answer: Option B

Explanation:

No answer description available for this question

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45. 

The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.
A. True
B. False

Answer: Option A

Explanation:

No answer description available for this question.

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46. 

The 8051 can handle ________ interrupt sources.
A. 3
B. 4
C. 5
D. 6

Answer: Option C

Explanation:

There are five interrupt sources for the 8051, which means that they can recognize 5 different events that can interrupt regular program execution. Each interrupt can be enabled or disabled by setting bits of the IE register. Likewise, the whole interrupt system can be disabled by clearing the EA bit of the same register.
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47. 

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

Answer: Option A

Explanation:

No answer description available for this question

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48. 

The address space of the 8051 is divided into four distinct areas: internal data, external data, internal code, and external code.
A. True
B. False

Answer: Option A

Explanation:

No answer description available for this question.

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