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Microprocessor

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

 DCX Rp
 DCR R
 XRA R
 ORA R

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Microprocessor
Consider the following statements: In 8085 microprocessor, data-bus and address bus are multiplexed in order to I)Increase the speed of microprocessor. II)Reduce the number of pins. III)Connect more peripheral chips. Which of these statements is/are correct?

 (II) only
 (II) & (III)
 (I) only
 (I), (II) & (III)

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

 320ns
 640ns
 1280ns
 960ns

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Microprocessor
A combinational PLD with a programmable AND array and a fixed OR array is called a

 PAL
 PLA
 PROM
 PLD

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Microprocessor
The processor status word of 8085 microprocessor has five flags namely:

 S, OV, AC, P, CY
 S, Z, OV, P, CY
 S, Z, AC, P, CY
 S, Z, AC, P, OV

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Microprocessor
Each instruction in assembly language program has the following fields:Lable fieldMnemonic fieldOperand fieldComment fieldThe correct sequence of these fields is?

2, 1, 4, 3
1, 2, 4, 3
1, 2, 3, 4
2, 1, 3, 4

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