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Posted By: kondapalli Member Level: Gold Posted Date: 09 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Production MICROPROCESSORS AND INTERFACING setno2 Question paper
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1. (a) Explain the difference between Machine Language, Assembly Language and
High Level language.
(b) Explain the requirement of a program counter, stack pointer and status flags
in the architecture of Intel 8085 Micro process. [8+8]
2. (a) Draw and explain the pin out diagram of 8086.
(b) Explain the various operations performed by Bus Interfacing unit in 8086.
[10+6]
3. (a) Briefly explain about the following instructions
i. ADC
ii. INC
iii. DEC
iv. MUL
v. DIV
(b) Write a program to solve the following expression. A2 + 2AB + B2 [10+6]
4. (a) Write the sequence of statements that declare the word named NWORD and
the FAR label EXTMOD as being external and the variable LWORD and the
label LOCMOD as being local and accessible by other source modules?
(b) Give the definition of a macro RESTORE that will pop the register contents
that have been pushed in the order AX, BX, CX, DX, SI and DI? [8+8]
5. (a) Write an instruction sequence that converts 8-digit packed BCD number to
its equivalent ASCII coded hex number.
(b) Write a program segment that will copy all ASCII characters in string STG
that are enclosed by single quotes to the string MESG and store the number
of characters moved in COUNT? [8+8]
6. (a) Compare interrupted I/O and DMA data transfer schemes. [8]
(b) Give the machine language code for each of the following instructions?
i. IN AL, 52H
ii. OUT 0CH, AL
iii. OUT DX, AX
iv. IN AX, DX. [2+2+2+2]
7. Interface an 8-bit DAC to 8255 with an address map of 0100H to 0103H. The DAC
provides output in the range of +5V to -5V. Write the instruction sequence for the
following?
(a) For generating a square wave with a peak to peak voltage of 2V and the
frequency will be selected from memory location ‘FREQ’.
(b) For generating a triangular wave with a maximum voltage of +4V and a
minimum of -2V. [8+8]
8. (a) A terminal is transmitting asynchronous serial data at 1200 bd. What is the
bit time? Assuming 8 data bits, a parity bit and 1 stop bit how long does it
take to transmit one character?
(b) Draw necessary circuit to interface 8251 to an 8086 based system with an
address 0C0H. Write the sequence of instructions to initialize 8251 for syn-
chronous transmission? (Assume the necessary data) [8+8]
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