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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 A
 PUSH PSW
 POP PSW

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Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 8085 has 5 interrupts lines, whereas 6800 has only two
 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O
 None
 8085 has multiplexed bus, whereas 6800 does not have

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

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

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Microprocessor
The address bus of any microprocessor is always

 Either unidirectional or bi-directional
 None
 Bi-directional
 Unidirectional

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Microprocessor
The maximum number of seven segment displays that can be connected to 8279 is

 16
 18
 12
 8

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Microprocessor
Because we wish to allow each ASCII code to occupy one location in memory, most memories are __________ addressable.

NIBBLE
BYTE
WORD (16 bits)
DOUBLEWORD (32 bits)

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