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Microprocessor

Microprocessor
Which one of the following microprocessor has 16-bit data bus?

 8085
 Z-80
 6502
 68000

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Microprocessor
The operating modes of 8255 A are called

Mode 0, mode 2 and mode 3
Mode 0 and mode 2
Mode 0 and mode 1
Mode 0, mode 1 and mode 2

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Microprocessor
The characteristics of RESET OUT signal is/are

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

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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?

 1, 2, 5
 2, 3, 5
 1, 3, 4
 1, 3, 5

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Microprocessor
_____________is used to read the status of the hardware interrupts (RST 7.5, RST 6.5, RST 5.5) by loading into the A register a byte which defines the condition of the mask bits for the interrupts.

 DI
 EI
 RIM
 SIM

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Microprocessor
A microprocessor without the interrupt facility

 cannot be interfaced with any I/O devices
 is best suited for process control system
 is not useful for process control system
 cannot be used for DMA operation

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