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Microprocessor

Microprocessor
How many 16-bit special purpose registers are present in 8085 microprocessor?

 2
 6
 8
 16

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Microprocessor
Identify the communication interfacing device from the following

 8257
 8255
 8251
 8155

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Microprocessor
The execution of RST n instruction causes the stack pointer to

 increment by two
None of these
 decrement by two
 remain unaffected

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Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 incremented by one.
 transferred to address bus.
 transferred to memory address register .
 transferred to memory data register.

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

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

 Enable the data bus to be used as low order address bus
 To disable data bus
 To achieve all the functions listed above
 To latch data D0-D7 from data bus

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