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WorksheetsRevision of 8086&8051
Total questions: 40
Worksheet time: 20mins
The instruction, MOV AX, 1234H is an example of -
Register Addressing mode
Immediate Addressing mode
Based indexed Addressing mode
Direct Addressing mode
8085 microprocessor has how many pins -
41
39
40
30
How many buses are connected as part of the 8085A microprocessor?
8
5
3
2
ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of-
Accumulator, arithmetic, logic circuits and five flags
Accumulator, arithmetic, logic circuits and five flags
Accumulator, temporary register, arithmetic, logic circuits and five flags
Accumulator, temporary register, arithmetic and logic circuits
Register pair used to indicate memory-
B and C
D and E
H and L
W and Z
The Intel 8086 microprocessor is a _______ processor
16 bit
32 bit
8 bit
4 bit
In 8086, Example for Non maskable interrupts are ________
rst6.5
intr
rst6.6
trap
RIM is used to check whether, _____
The interrupt is Masked or not
The write operation is done or not
both 1 & 2
None of these
Which of following instruction subtract memory and carry
from a,b
AB[a,x,y]
SBC[a,b]
SUB[a,b,d]
tst[a,b]
Which of following load the stack pointer
bgt
LDS
bhs
RTS
What is SIM?
Set interrupt mask.
Sorting interrupt mask
Select interrupt mask
None of these
A machine language instruction format consists of -
Operation code field
Operation code field & operand field
Operand field
none of the mentioned
Which is the microprocessor comprises:
Register section
one or more ALU
control unit
All of these
A set of register which contains are:
Data
Memory address
Result
All of these
There are primarily two types of register:
General purpose register
Dedicated Register
A and B
None of these
Which is used to store critical pieces of data during subroutines and interrupts:
Stack
Queue
Accumulator
Data register
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?
Clock cycle
Memory cycle
Machine cycle
Instruction cycle
In 8085 microprocessor system with memory mapped I/O, which of the following is true?
Devices have 8-bit address line
Devices are accessed using IN and OUT instructions
There can be maximum of 256 input devices and 256 output devices
Arithmetic and logic operations can be directly performed with the I/O data
consider the following
I) Sign flag
II) Trap flag
III) Parity flag
IV) Auxiliary carry flag
Which one of the above flags is/are present in 8085 microprocessor?
(I) only
(I)&(II) only
(II) & (III) only
(I),(III)&(IV)
The___________ translates a byte from one code to another code
XLAT
XCHNG
POP
PUSH
What is the file extension is used to load in a
microcontroller to execute an instruction?
.doc
.c
.txt
.hex
What are the two instruction set architecture (ISA)
classifications?
SIDC & BIDC
CISC & RISC
CISC & VISC
What is internal RAM memory of 8051 microprocessor?
32 bytes
64 bytes
128 bytes
256 bytes
How many timers/counter 8051 micro controller have?
1
2
5
8
Register that is used to holds the memory address of the
next instruction to be executed is
Program memory
Program counter
Control unit
Instruction decoder
The 8051 microprocessor has ________ parallel I/O ports.
2
3
4
5
Which instructions affect the program counter?
call & Return
call & Jump
Push & Pop
Return & Jump
Which register is used to store the output generated by
ALU?
Special function register
Timer register
Accumulator
Stack pointer
In 8086 microprocessor , the address bus is ________ bit wide
10 bit
20 bit
16 bit
12 bit
How many registers can be utilized to write the programs by an effective selection of register bank in program status word (PSW)?
8
16
32
64
Which operations are performed by stack pointer during its incremental phase?
push
pop
Return
All of the above
Which bits plays a significant role in the selection of a bank register of Program Status Word (PSW)?
RS1
RS0
Both a&b
None of the above
Which flags represent the least significant bit (LSB) and most significant bit (MSB) of Program Status Word (PSW) respectively?
Parity Flag & Carry Flag
Parity Flag & Auxiliary Carry Flag
Carry Flag & Overflow Flag
Carry Flag & Auxiliary Carry Flag
Which register bank is supposed to get selected if the values of register bank select bits RS1 & Rs0 are detected to be ‘1’ & ‘0’ respectively?
Bank 0
Bank 1
Bank 2
Bank 3
Which locations of 128 bytes on-chip additional RAM are generally reserved for special functions?
80H to 0FFH
70H to 0FFH
90H to 0FFH
60H to 0FFH
What is the required baud rate for an efficient operation of serial port devices in 8051 micro controller?
1200
2400
4800
9600
Which memory allow the execution of instructions till the address limit of 0FFFH especially when the External Access (EA) pin is held high?
Internal Program Memory
External Program Memory
Both a&b
None of the above
What is the counting rate of a machine cycle in correlation to the oscillator frequency for timers?
1 / 10
1 / 12
1 / 15
1 / 20
Which special function register play a vital role in the timer/counter mode selection process by allocating the bits in it?
TMOD
TCON
SCON
PCON
Why is it not necessary to specify the baud rate to be equal to the number of bits per second?
Because each bit is preceded by a start bit & followed by one stop bit
Because each byte is preceded by a start byte & followed by one stop byte
Because each byte is preceded by a start bit & followed by one stop bit
Because each bit is preceded by a start byte &followed by one stop byte
