13-10-2012, 04:13 PM
TWO MARK ELECTRONICS QUESTION ANSWER
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1.What is Microprocessor ?
It is a program controlled semiconductor device (IC}, which fetches,
decode and executes instructions.
2. What are the basic units of a microprocessor ?
The basic units or blocks of a microprocessor are ALU, an array of
registers and control unit.
3.what is Software and Hardware?
The Software is a set of instructions or commands needed for
performing a specific task by a programmable device or a computing
machine.The Hardware refers to the components or devices used to form
computing machine in which the software can be run and tested.
Without software the Hardware is an idle machine.
4. What is assembly language?
The language in which the mnemonics (short -hand form of
instructions) are used to write a program is called assembly language.
The manufacturers of microprocessor give the mnemonics.
5. What are machine language and assembly language programs?
The software developed using 1's and 0's are called machine language,
programs. The software developed using mnemonics are called
assembly language programs.
6. What is the drawback in machine language and assembly language,
programs?
The machine language and assembly language programs are machine
dependent. The programs developed using these languages for a
particular machine cannot be directly run on another machine .
7. Define bit, byte and word.
A digit of the binary number or code is called bit. Also, the bit is the
fundamental storage unit of computer memory.
The 8-bit (8-digit) binary number or code is called byte and 16-bit
binary number or code is called word. (Some microprocessor
manufactures refer the basic data size operated by the processor as
word).
8. What is a bus?
Bus is a group of conducting lines that carries data, address and control signals.
9. Why data bus is bi-directional?
The microprocessor has to fetch (read) the data from memory or input
device for processing and after processing, it has to store (write) the
data to memory or output device. Hence the data bus is bi-directional.
10. Why address bus is unidirectional?
The address is an identification number used by the microprocessor to
identify or access a memory location or I / O device. It is an output
signal from the processor. Hence the address bus is unidirectional.
11. What is the function of microprocessor in a system?
The microprocessor is the master in the system, which controls all the
activity of the system. It issues address and control signals and fetches
the instruction and data from memory. Then it executes the instruction
to take appropriate action.
12. What are the modes in which 8086 can operate?
The 8086 can operate in two modes and they are minimum (or
uniprocessor) mode and maximum ( or multiprocessor) mode.
13. What is the data and address size in 8086?
The 8086 can operate on either 8-bit or 16-bit data. The 8086 uses 20
bit address to access memory and 16-bit address to access 1/0 devices.
14. Explain the function of M/IO in 8086.
The signal M/IO is used to differentiate memory address and 1/0
address When the processor is accessing memory locations MI 10 is
asserted high and when it is accessing 1/0 mapped devices it is asserted
low.