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Microprocessor

Microprocessor
Which instruction is required to rotate the content of accumulator one bit right along with carry?

 RAL
 RAR
 RRC
 RLC

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Microprocessor
During which T-state, contents of OP code from memory are loaded into IR (Instruction Register)?

 T1 OP code fetch
 T3 OP code fetch
 T2 OP code fetch
 T4 OP code fetch

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Microprocessor
A microprocessor without the interrupt facility

 is not useful for process control system
 is best suited for process control system
 cannot be interfaced with any I/O devices
 cannot be used for DMA operation

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Microprocessor
The content of the A15-A8 (higher order address lines) while executing “IN 8-bit port address” instruction are

 all bits reset (i.e. 00H)
 same as the content of A7-A0
 irrelevant
 all bits set (i.e. FFH)

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Microprocessor
Which general register or general register pair is incremented/decremented by 2 during PUSH and POP instructions?

 D-E.
 Program Counter.
 H-L.
 Stack Pointer.

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Microprocessor
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

 Instruction cycle
 Memory cycle
 Clock cycle
 Machine cycle

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