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Microprocessor

Microprocessor
A single instruction to clear the lower nibble of accumulator in 8085 language assembly is

 ANI OFH
 XRI FOH
 ANI F0H
 XRI 0FH

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Microprocessor
An 8-bit microprocessor signifies that

 8-bit address bus
 8-bit controller
 8-bit data bus
 8-interrupt lines

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Microprocessor
Identify the communication interfacing device from the following

 8251
 8255
 8155
 8257

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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
 POP PSW
 PUSH PSW

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Microprocessor
The data lines of 8085 microprocessor are multiplexed with

 higher order address lines
 status lines
None of these
 lower order address lines

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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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