86. The chip select access time for reading ROM contents is

1. 1. the delay between application of proper chip select signal and the stable output address

   
   
   

   2. the delay between the previous valid output data and the next change in address

   
   
   

   3. the time for which the output data remains valid when the device is no longer selected

   
   
   

   4. maximum time for which the valid address can be changed

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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87. The decoding circuit has been used to generate active low chip. Signal for a microprocessor peripheral (address line are designated as A 0 to A7 for I/O address)
    
    

1. 1. 60H to 63 H

   
   
   

   2. A4 to A7H

   
   
   

   3. 71H to 73H

   
   
   

   4. 70H to 73H

   
   
   

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   NA

   Correct Option: A

   NA

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88. An ‘Assembler’ for a micro-processor is used for

1. 1. assembly of processors in a production line

   
   
   

   2. creation of new programmes using different modules

   
   
   

   3. translation of a program from assembly language to machine language

   
   
   

   4. translation of a higher level language into English text

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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89. A single instruction to clear the lower four bits of the accumulator in 8085 assembly language is
    

1. 1. XRI OFH

   
   
   

   2. ANI FOH

   
   
   

   3. XRI FOH

   
   
   

   4. ANI OFH

   
   
   

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   NA

   Correct Option: B

   NA

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90. Which of the following statements is true?
    

1. 1. ROM is a Read/ Write memory

   
   
   

   2. PC points to the last instruction that was executed

   
   
   

   3. Stack works on the principle of LIFO

   
   
   

   4. All instructions affect the flags

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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