Acharya Nagarjuna University (ANU) 2005 B.Tech Electronics and computers EM 311 Micro Processors - Question Paper

III/IV B.Tech Degree exam
October 2005
Embedded Systems
EM 311

(EM 311)

III/IV B.Tech. DEGREE EXAMINATION, OCTOBER 2005.

First Semester

MICROPROCESSORS

Time : Three hours    Maximum : 70 marks

Answer Question No. 1 compulsorily.

(7x2 = 14) Answer ONE question from each Unit.

(4 x 14 = 56) AU questions carry equal marks.

1. (a) What are the differences between 8086 and

80286 m Ps?

(b)    What are assembly language program development tools?

(c)    What are the differences between macro and procedure?

(d)    Give examples for pseudo instructions of 8086 assembler with description.

(e)    What do status signals S_z,S_itS_s,S_$ and S_? represent?

(f)    What are the difference between AAM and AAD instructions of 8086?

(g)    If HOLD input and NMI input are simultaneously activated, which one is service first? Justify your answer.

UNIT I

2. (a) Write the functional block diagram of 8086 and explain how 8086 is reset with power *on and manual operation and write the after-effect of resetting 8086.

(b)    Write the merits and demerits of memory segmentation in 8086. Describe the address mode byte in instruction format of 8086.

Or

(c)    Explain in detail the 8086 programming model.

(d)    Implement WHILE-DQ construct using 8086 assembly language program that can generate exec, file with assembler and linker.

3.    (a) Describe the following 8086 instructions by giving complete instruction description :

(i)    LDS BX, DWORD PTR[SI]

(ii)    SCANSB

(iii)    TEST CX.DX

(iv)    MUL BYTE PTR[BX]

(v)    RET 8

(vi)    ESC 31H.MYDATA.

Or

(b)    Write 8086 assembly language procedure for setting the direction flag and macro for clearing the direction flag. Use main line program for block data transfer using string instructions.

(c)    List three methods of passing parameters to a procedure with relative merits and demerits.

UNIT III

4,    (a) Write and explain the basic system timing of 8086 in minimum mode.

Or

(b) Using type 1 interrupt, perform instruction tracing of main line program segment shown below, by using relevant interrupt service procedure that displays all registers

MOV AX, 1234H MOV BX, 5678H MOV CX, 9ABCH ADD AX,BX

5, (a) Write the maximum mode signals and their descriptions of 8086,

(b)    Briefly describe the architecture of SO 166.

Or

(c)    Give the > block diagram of 8086-system with 80&7 co-processor and explain how this system executes the following 8086-8087 program segment

MOV AX, 1111H

FMUL FSQRT

CMP AX, BX

JZ NEXT

MOV BX, AX NEXT MOV AX,BX

4    (EM 311)

Attachment: acharya-nagarjuna-university--anu--2005-b-tech-electronics-and-computers-7410-1.pdf

Earning:   Approval pending.