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Microprocessor

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

 PUSH PSW
 PUSH A
 PUSH SP
 POP PSW

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Microprocessor
Which one of the following statement is false?

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

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Microprocessor
S0 and S1 pins are used for

 acknowledging the interrupt
 serial communication
 indicating the processor’s status
None of these

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Microprocessor
During which T-state, contents of OP code from memory are loaded into IR (Instruction Register)?

 T4 OP code fetch
 T3 OP code fetch
 T1 OP code fetch
 T2 OP code fetch

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

 6
 8
 16
 2

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Microprocessor
Identify the non-programmable interfacing device from the following

 8257.
 8212.
 8255.
 8295.

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