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Microprocessor

Microprocessor
Which of the following instruction is not possible in 8085?

 POP B
 POP D
 POP 30 H
 POP PSW

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Microprocessor
Number of Hex digits needed to represent the 20-bit address of a memory location are

 16
 5
 20
 4

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Microprocessor
The number of interrupt lines in 8085 is

2
4
5
3

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Microprocessor
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1, 2, 3 and 4
 3 and 4 only
 1, 2 and 3
 1 and 2 only

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Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 incremented by one.
 transferred to memory address register .
 transferred to address bus.
 transferred to memory data register.

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Microprocessor
The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is

 1280ns
 960ns
 320ns
 640ns

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