M.Sc. (Semester II) (CBCS) Examination Mar/Apr-2018
Physics (Applied Electronics)
MICROPROCESSORS MICROCONTROLLERS
Time: 2½ Hours
Max. Marks: 70
Instructions: Q. and are compulsory. Answer any three questions from Q.3 to Q.7. Figures to the right indicate full marks.
Q.1

Choose the correct option
08
Which of the following SFR is not bit addressable?
PO
PSW
PCON
TCON
THE SFRs are maintained in the memory location.
80H onwards
30H onwards
00H onwards
07H onwards
An alternate function of P3.4 in 8051 is
Timer 0
Timer 1
Interrupt 0
Interrupt 1
Which of the following command copy the content of RAM whose address is in R0 to P1
MOV R0
MOV P1
MOV P1, R0
MOV P1, R0
The directive DQ means
Define quantum
Define Quad byte
Define Quad word
None of these
The BIU prefetches the instruction from memory and store them in
queue
register
memory
stack
The translates a byte from one code to another code.
XCHG
POP
PUSH
XLAT
In max mode, control bus signal S0, S1 and S2 are sent out in from.
decoded
encoded
shared
unshared

State true or false:
06
Serial Communication interrupt has lowest priority.
In 8086 total address lines are 16.
The STD (Set Direction Flag) decrements the string pointer.
8086 microprocessor is of CISC architecture.
After reset the value in the stack pointer of 8051 is 00H.
The length of the instruction queue in 8086 is of 8 bytes.
Page 2 of 2
SLR-UR-565
Q.2
Draw and explain the PSW format of 8086.
05
Explain the maximum mode of 8086.
05
Explain the hardware interrupts of 8051.
04
Q.3
Explain the concept of memory segmentation in 8086. What are its advantages?
08
Write a assembly language program to block transfer in 8086 by using string instructions.
06
Q.4
Draw and explain the architecture of 8086.
08
Explain the following instructions of 8086.
06
i. NEG AL
ii. REPNZ
Q.5
Explain the memory organization of 8051.
08
Explain the following pins of 8051.
06
i. EA
ii. PSEN
Q.6
Explain the SFRs associated with Timers Counters.
08
Write a assembly language program to find a square of the unpacked BCD number by using lookup table.
06
Q.7
Explain the different modes of serial communication exit in 8051.
08
Explain the Port 1 structure of 8051.
06