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First-Term Examination

Fifth Semester [B.Tech] - September 2005

Paper Code : ETEC 303 Subject : Microprocessor System I

Time : 11/2 Hours

Maximum Marks : 30

Note : Attempt any 3 questions in all. Each question carries 10 marks. Make suitable assumptions wherever necessary.

Q1

( a )

Draw the logic diagram of a circuit the generates the control strobes
MEMR, MEMW, I/OR AND I/OW

3

( b )

Explain the functions of the following pins in the 8-bit microprocessor 8085A.
i ) READY   ii ) HOLD  iii) RESETIN
3
( c ) Explain the methods of driving the clock input circuits X1 and X2. 4

Q2

( a )

List the machine cycle involved in the following instructions in the order of their occurrence.

  1. LHLD addr
  2. MOV R, M
  3. DAD Rp
  4. CALL addr

4

( b )

Discuss the addressing modes available in the 8-bit microprocessor 8085A.

3
( c ) Write a program for the 8-bit microprocessor 8085A, to multiply two 8-bit numbers stored in memory locations with addresses N1 and N2 respectively. The product is to be placed in memory locations with addresses N3 and N4, lower byte of the product being at address N3. Use assembly language mnemonics. 3

Q3

( a )

Write a delay subroutine for the 8085A to generate a delay of 100ms. Assume the crystal frequency to be 6.250 MHz.

3

( b )

State the conditions to be satisfied for the interrupt request on the input pin, INTR, to be recognized as a valid interrupt for service. 7

Q4

Write short notes on :

10

( a )

Programmable Interrupt Controller, 8259A

4

( b )

Halt and Hold states in 8085A

3

( c )

SIM and RIM instructions

3

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