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Microprocessor

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

 PUSH SP
 PUSH PSW
 PUSH A
 POP PSW

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Microprocessor
The content of the A15-A8 (higher order address lines) while executing “IN 8-bit port address” instruction are

 all bits reset (i.e. 00H)
 same as the content of A7-A0
 irrelevant
 all bits set (i.e. FFH)

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Microprocessor
In 8085 microprocessor, in response to RST 7.5 interrupts the execution is transferred to memory location

 0000H
 003CH
 002CH
 0034H

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Microprocessor
Identify the communication interfacing device from the following

 8155
 8257
 8251
 8255

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Microprocessor
The characteristics of RESET OUT signal is/are

 this signal can be used to reset other devices.
 the signal is synchronized to the processor clock.
 indicates that µp is being reset.
 all.

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Microprocessor
While STC instruction executes,

 all flags will be affected.
 no flags will be affected.
 only carry flag will be affected.
 only carry and zero flags will be affected.

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