Multivibrators and 555 Timer - General Questions (6)

Directions to Solve

Multivibrators and 555 Timer - 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:

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42.

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

A.	True
B.	False

Answer: Option A

Explanation:

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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:

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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:

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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:

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46.

The 8051 can handle ________ interrupt sources.

A.	3
B.	4
C.	5
D.	6

Answer: Option C

Explanation:

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47.

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:

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48.

The 8051 has ________ 16-bit counter/timers.

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

Answer: Option B

Explanation:

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