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Microprocessor

Microprocessor
SPHL instruction copies the content of H-L register pair to the _________.

 Stack Pointer
 D-E
 PSW
 B-C

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Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 An I/O read cycle
 A memory read cycle
 A memory write cycle
 An op-code fetch cycle

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Microprocessor
The maximum number of seven segment displays that can be connected to 8279 is

 16
 8
 18
 12

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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

 8 Mhz.
 2 Mhz.
 1Khz.
 2 Khz.

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Microprocessor
Which one of the following statement is false?

 A microprocessor has an ALU
 A microprocessor has bi-directional data bus
 A microprocessor has unidirectional address bus
 A microprocessor has bi-directional address bus

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Microprocessor
8085 microprocessor has how many pins

 39.
  40.
  30.
 41.

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