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Microprocessor

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

 960ns
 640ns
 1280ns
 320ns

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Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

 A is false but R is true
 A is true but R is false
 Both A & R are true and R is the correct explanation of A
 Both A & R are true but R is not the correct explanation of A

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Microprocessor
In 8085 name/names of the 16 bit registers is/are

 stack pointer.
 both A and B.
 none of these.
 program counter.

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Microprocessor
Assuming LSB is at position 0 and MSB at position 7, which bit positions are not used (Undefined) in flag register of an 8085 microprocessor?

 2, 3, 5
 1, 3, 4
 1, 2, 5
 1, 3, 5

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

 PUSH SP
 PUSH A
 PUSH PSW
 POP PSW

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

 DCX Rp
 DCR R
 XRA R
 ORA R

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