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Microprocessor

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

 16
 4
 5
 20

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Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 A memory read cycle
 An I/O read cycle
 An op-code fetch cycle
 A memory write cycle

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Microprocessor
Assuming LSB is at position 0 and MSB at position 7, which bit positions are not used (Undefined) in flag register of an 8085 microprocessor?

 1, 2, 5
 2, 3, 5
 1, 3, 4
 1, 3, 5

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Microprocessor
HLT opcode means

  end of program.
  load accumulator with contents of register.
  store result in memory.
  load data to accumulator.

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Microprocessor
XCHG instruction exchanges the content of H-L with ______ register pair.

 Stack Pointer
 D-E
 PSW
 B-C

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Microprocessor
After RESET 8255 will be in

 mode 0; all ports are input
 mode 0; all ports are output
 mode 2
 unchanged condition

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