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Microprocessor

Microprocessor
8085 microprocessor has how many pins

  40.
 41.
  30.
 39.

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

 RLC
 RAR
 RRC
 RAL

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 There are 16 address lines
 It counts 16-bits at a time
 It has to fetch two 8-bit data at a time
 It facilitates the user storing 16-bit data temporarily

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Microprocessor
In order to save accumulator value on the stack, which of the following instruction may be used

 PUSH PSW
 PUSH SP
 POP PSW
 PUSH A

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Microprocessor
While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

 2 Mhz.
 8 Mhz.
 2 Khz.
 1Khz.

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Microprocessor
Identify the programmable DMA controller from the following

 8279
 8257
 8251
 8253

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