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Microprocessor & Microcontrollers Questions

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The device that generates the basic timing clock signal for the operation of the circuit using crystal oscillator is


Atiming unit

Btiming and control unit

Coscillator

Dclock generator

Answer: Option C

Explanation:

The basic timing clock signal can be generated by an oscillator circuit using the crystal oscillator.

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The instruction, MOV AX, 1234H is an example of


Aregister addressing mode

Bdirect addressing mode

Cimmediate addressing mode

Dbased indexed addressing mode

Answer: Option C

Explanation:

Since immediate data is present in the instruction that's 1234H

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The clock speed of 8085 is


A1MHz

B1KHz

C3.2KHz.

D3.2MHz.

Answer: Option D

Explanation:

8085 requires a signal +5V power supply and operates at 3.2 MHZ single phase clock.

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The processor status word of 8085 microprocessor has five flags namely:


AS, Z, AC, P, CY

BS, OV, AC, P, CY

CS, Z, OV, P, CY

DS, Z, AC, P, OV

Answer: Option A

Explanation:

8085 microprocessor has 5 status flag S ? Sign flag Z ? Zero flag AC ? Auxiliary carry flag P ? Parity flag CY ? Carry flag

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Give the names of the buses present in a controller for transferring data from one place to another?


Adata bus, address bus

Bdata bus

Cdata bus, address bus, control bus

Daddress bus

Answer: Option C

Explanation:

There are three internal buses associated with processors: the data bus, address bus, and control bus.


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Which flags represent the least significant bit (LSB) and most significant bit (MSB) of Program Status Word (PSW) respectively?


AParity Flag & Carry FLag

BParity Flag & Auxiliary Carry Flag

CCarry Flag & Overflow Flag

DCarry Flag & Auxiliary Carry Flag

Answer: Option A

Explanation:


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