WorksheetsMPMC Model 2 Part B
Total questions: 15
Worksheet time: 15mins
Consider the following statements: In 8085,
a) In the T2 state, the CPU sends the address to memory or I/O and the ALE signal for demultiplexing .
b) Ready pin of a microprocessor is used to to introduce wait states.
Both statements are true
Both statements are false
First statement is true, second statement is false
First statement is false, second statement is true
Consider the following statements: In 8085,
a) The no. of address lines required to address a memory of size 16K is 15 lines.
b) For I/O mapped I/O addressing, the number of I/Os than can be accessed is 256.
Both statements are true
Both statements are false
First statement is true, second statement is false
First statement is false, second statement is true
Consider the following statements: Arithmetic Logic Unit (ALU)
1.Performs arithmetic operations
2.Performs comparisons.
3.Communicates with I/O devices
4.Keeps watch on the system
Which of these statements are correct?
1, 2, 3 and 4
1, 2 and 3
1 and 2
3 and 4
The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is
320ns
640ns
960ns
1280ns
A microprocessor differentiates between op code, data/address at any time by
the sequence in which memory contents are fetched by it
its internal registers
the stack pointer
the program counter
Consider the following statements: In 8085,
a) The data bus of a microprocessor can be unidirectional or bidirectional.
b) The address bus of any microprocessor is always uni-directional.
Both statements are true
Both statements are false
First statement is true, second statement is false
First statement is false, second statement is true
When RET instruction is executed by any subroutine then
without any operation, the calling program would resume from instruction immediately following the call instruction.
the PC will be incremented after the execution of the instruction.
the top of the stack will be popped out and assigned to the PC.
without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
Consider the following statements: In 8051,
a) This program code will read data from port 0 and write it to port 2, and it will stop looping when bit 3 of port 2 is set:
STAT:MOV A, PO
MOV P2, A
JNB P2.3, STAT
b) The contents of the accumulator after this operation
MOV A,#2BH
ORL A, 00H
will be 1BH
Both statements are true
Both statements are false
First statement is true, second statement is false
First statement is false, second statement is true
What does the attached subroutine do?
Multiplies two numbers
Divides two numbers
Finds the square root of a number
None of the above
8279 has to be operated with 16 of 8 bit characters, Right entry, encoded scan and with 2 key lockout. What is the control word?
18H
24H
48H
1AH
Counter 2 of 8254 has to be operated in Mode 4 with an initial 16 bit value and with binary count. What is the control word?
F8
B8
84
A8
The Initialisation command word 1 for 8259 is 9A; The 8259 operates in ----------mode and is ---------- triggered.
Cascade mode, Level triggered
Cascade mode, Edge triggered
Single mode, Edge triggered
Single mode, Level triggered
The address of Port A in 8255 is 60H. Write an 8085 instruction such that Port A is in Mode 1 input, Port B is in Mode 1 output and Port C is input.
MVI A, 0DH; OUT 60H;
MVI A, B0H; OUT 63H
MVI A, BDH; OUT 63H
MVI A, 0BH; OUT 63H;
Consider the following statements:
a) The load cell is based on the principle that the resistance of a wire changes when it is under strain.
b) A resolver can be used for position sensing.
Both statements are true
Both statements are false
First statement is true, second statement is false
First statement is false, second statement is true
DPTR=3000H; A = 05H; What is the content of the DPH register after execution of the instruction
MOVC , @A+DPTR
30H
05H
00H
May not be any of the above
