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Microprocessor Interview Questions and Answers

What is the difference between 8086 and 8088?
The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in 8088and 6 byte in 8086.

Give example for Non-Maskable interrupts?
Trap is known as Non-Maskable interrupts, which is used in emergency condition.

Give examples for Micro controller?
Z80, Intel MSC51 &96, Motorola are the best examples of Microcontroller.

What is clock frequency for 8085?
3 MHz is the maximum clock frequency for 8085.

Give an example of one address microprocessor?
8085 is a one address microprocessor.

Give examples for 8 / 16 / 32 bit Microprocessor?
8-bit Processor - 8085 / Z80 / 6800; 16-bit Processor - 8086 / 68000 / Z8000; 32-bit Processor - 80386 / 80486

What is meant by a bus?
A bus is a group of conducting lines that carriers data, address, & control signals.

What are the various registers in 8085?
Accumulator register, Temporary register, Instruction register, Stack Pointer, Program Counter are the various registers in 8085

Why crystal is a preferred clock source?
Because of high stability, large Q (Quality Factor) & the frequency that doesn’t drift with aging. Crystal is used as a clock source most of the times.

In 8085 which is called as High order / Low order Register?
Flag is called as Low order register & Accumulator is called as High order Register.

Name 5 different addressing modes?
Immediate, Direct, Register, Register indirect, Implied addressing modes

In what way interrupts are classified in 8085?
In 8085 the interrupts are classified as Hardware and Software interrupts.

What is the difference between primary & secondary storage device?
In primary storage device the storage capacity is limited. It has a volatile memory. In secondary storage device the storage capacity is larger. It is a nonvolatile memory. Primary devices are: RAM / ROM. Secondary devices are: Floppy disc / Hard disk.

Which Stack is used in 8085?
LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first.

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