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SPRING 2014
ASSIGNMENT
PROGRAM MCA
(REVISED FALL 2012)
SEMESTER FOURTH
SUBJECT CODE
& NAME MCA4010- MICROPROSESSOR
CREDIT 4 BK ID
B1778 MAX. MARKS 60
Q. No.
1 Write short notes on:
a)
Central Processing Unit
b)
Memory Unit 5+5 10
Answer:
A)
Central Processing Unit:
The central processing
unit (CPU) is the electronic brain of the computer. CPU consists of Arithmetic
Logic Unit (ALU) and Control Unit (CU).
(a)
Arithmetic Logic Unit (ALU): The arithmetic logic unit (ALU)
is responsible for arithmetic and logical operations. Basically an
Arithmetic-Logic Unit (ALU) is an electronic circuit used to carry out the
arithmetic operations like addition, subtraction, multiplication and division.
It also carries out logical operations like greater than, less than, equal to
etc. It performs the operation on the data provided by the input devices. It
also does the comparison operation which allows a program to make decisions
based on its data input and results of the previous calculations. The ALU
operates on
2 Write
short notes on:
a) Bus
Interface Unit (BIU)
b)
Execution Unit (EU) 5+5 10
Answer:
A)
Bus Interface Unit
(BIU): The BIU handles all the data and address on the
buses for the execution unit (EU). It performs all bus operations such as
instruction fetching, reading and writing operands for memory and calculating
the addresses of the memory operands. The instruction bytes
3 Write
short notes on:
a) REP
Prefix
b)
Table Translation 5+5 10
Answer:
A)
REP Prefix
Because string
operations inherently involve looping, the 8086 machine language includes a
prefix that considerably simplifies the use of string primitives with loops.
This prefix has the machine code
4
Describe about Key-code Data Formats and FIFO Status Word formats. 5+5 10
Answer:
Key-code Data Formats:
After a valid Key closure, the key code is
entered as a byte code into the FIFO RAM, in the following format, in scanned
keyboard mode. The Key code format contains 3-bit contents of the internal row
counter, 3-bit contents of the column counter and status of the SHIFT and CNTL
Keys The data
5 Write
a note on
(a) RS
232 standard
(b) IEEE 488 standard 5+5 10
Answer:
A) RS232 Standard
RS232 standard is developed by the Electronic
Industry Association (EIA) in 1962 and was revised and renamed as RS232C. RS
stands for "recommended standard." This is a standard hardware
interface used for implementing asynchronous serial data communication ports on
devices such as
6 Write
short note on:
a)
Parallel Printer Interface (LPT)
b)
Universal Serial Bus (USB) 5+5 10
Answer:
A)
Parallel Printer
Interface (LPT)
The parallel printer
interface (LPT) is located on the rear panel of the PC. The LPT stands for line
printer. The Parallel Port Interface on the PC compatible computer is one of
the most flexible interfaces for connecting the PC to a wide range of devices.
The interface was originally intended purely for connection to printers but due
to the simple nature of the digital control lines it has found
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