Microprocessors Quiz- 8085 Quiz-2

Microprocessors Quiz- 8085 Quiz -2

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1. JNC, means

Jump if NOT carry

Jump if new Carry

Jump if Carry

Jump Never Carry

2. This instruction is for exchanging the contents of two register pairs.

XTHL

XCHG

EXCHNG

both b and c

3. ______is to store the contents of the accumulator to a location address.

STA

LDA

LDAX

STAX

4. A microprocessor 8085 is working on a 3mHz frequency and still, we use a 6Mhz crystal oscillator to

get very high frequency

achieve 50% duty cycle

3mhz crystal is not available

All of the above.

5. The flag that specifies the carry is generated by the 3rd and passed on to the 4th.

Carry Flag

Auxiliary Carry Flag

Parity Flag

Carry Forward

6. MVI is an instruction used for________

moving data immediately in the register.

move data in memory

move data immediately anywhere.

All of the above.

7. Which of these is a main purpose of SIM instruction

is to mask and unmask the lower priority interrupts like RST 5.5, RST 6.5, and RST 7.

to read the status of interrupts

The instruction loads 8 bot data from the accumulator

None of the above.

8. In the instruction LXI B, 3000H, X and B means?

X means Pair and B means we are using BC pair

X means pair and B means we’re using register

X means H-L pair and B is for BC pair

X is for crystal oscillator.

9. This instruction is used to jump to a memory location from the current memory location to any other memory location.

JMP

SHIFT

RRC

None of the above.

10. This instruction only jumps to a specified address if the Zero Flag is set or else the program control flows in the sequential flow.

JNZ

JCZ

JIZ

11. PCHL means,

Load personal Computer with H-L contents

Load stack with H-L contents

Load Program Counter with HL contents.

None of the above
.

12. RET is a

1-Byte instruction.

2-Byte instruction.

3-Byte instruction.

4-Byte instruction.

13. In the instruction ADD B

the contents of the B register are added with the content of A register

the contents of the B register are added to the B register itself.

the contents of the B register are added with 1

the instruction requires 1 more operand to state the source operand also.

14. In the register addressing modes

the data to be operated is available inside the registers, operand are registers

the data to be operated is available inside the memory and registers

both a and b

All of the above

15. ______is to store the contents of the accumulator to a location address.

STA

LDA

LDAX

STAX

16.

MOV R, M is an instruction, where R is denoted for a register and M ______

is the memory address where the H-L pair is pointing at that time.

is the memory address in your hard disk where you have saved your data.

is the memory address in the microprocessor’s inbuilt memory.

is the M register.

17. The microprocessor 8085 requires the ______ input for operating with proper tuning with other peripherals connected to it.

Data

User Input

5V DC

Clock pulses

18. When ALE pin is at HIGH(1), then the PINS AD0-AD7 are used as

Data Lines

Data Lines and Address lines same time.

Address line

Higher-Order address bus

19. In 8085 AD0-AD7 are

address + data lines combined since can only hold 8-bit data so these lines are multipurpose and are bidirectional.

address + data lines combined since can only hold 8-bit data so these lines are multipurpose and are unidirectional.

higher-order address lines rarely used.

None of the above.

20. ________ instructions allow transferring/ copying the data between register to registers, register to memory, vice versa.

Machine control Instructions

Logical Instructions

Branching Instruction

Data Transfer

21. Data transfer instructions don’t affect any flags in the flags register of the microprocessor. Answer True/False

True

False

22. ______ instruction is used to perform the AND operation.

ANA

AND

INR

Logical AND

23. ________is the increment instruction, that increments the register contents by 1. The contents of a particular register are incremented by 1

INX

INA

INR

INCR

24. This is used to transfer the 8 bits of data at a time.

Address Bus

8-Bit Data Bus

H-L Pair

All of the above

25. The maximum size of external memory you can interface with the 8085 processor is

32KB

32Bytes

64 Kb

1 mb

26. Using DAA the content of the accumulator is adjusted into

valid BCD or decimal number after two Binary or decimal numbers are added.

valid BCD or decimal number after two Binary or decimal numbers are subtracted.

valid BCD or decimal number after two Binary or decimal numbers after an AND operation.

Binary

27. In a Microprocessor, the address of the new next instruction to be executed is stored in

Stack Pointer

Program Counter

Instruction Register

Accumulator

28. The instruction used to load the data at any address to the Accumulator.

LDA

LHLD

LXI

MOV