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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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