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Microprocessor

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

 RLC
 RAL
 RRC
 RAR

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Microprocessor
Which of the following pair of gates can form a latch?

A pair of cross coupled NAND
A cross coupled NAND/OR
A pair of cross copled AND
A pair of cross coupled OR

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Microprocessor
Which of the following instruction will never affect the zero flag?

 ORA R
 XRA R
 DCX Rp
 DCR R

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Microprocessor
In one’s complement 8 bit representation 11111111 represents

1
-0
-1
+0

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Microprocessor
During the execution of the instruction, the ________tests the status and control flags and updates them based on the results of executing the instruction.

 Bus Interface Unit (BIU)
 None of these
 Both ‘c’ and ‘d’
 Execution Unit (EU)

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Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 None
 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O
 8085 has multiplexed bus, whereas 6800 does not have
 8085 has 5 interrupts lines, whereas 6800 has only two

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