page 2 | Microprocessors and Microcontrollers MCQ with Solution

Q21. In 8085, the DAA instruction is used for

Direct Address Accumulator

Double Add Accumulator

Decimal Adjust Accumulator

Direct Access Accumulator

Q22. The following instruction copies a byte of data from the accumulator into the memory address given in the instruction

STA address

LDAX B

LHLD address

LDA address

Q23. A microprocessor is ALU

and control unit on a single chip

and memory on a single chip

register unit and I/O device on a single chip

register unit and control unit on a single chip

Q24. Which of the following 8085 instruction will require maximum T-states for execution?

XRI byte

STA address

CALL address

JMP address

Q25. How many bytes are present In the instruction of the 8085 microprocessor?

One or two

One, two or three

One only

Two or three

Q26. To multiply a number by 8 in 8085 we have to use RAL instruction:

Once

Twice

Thrice

Four times

Q27. In 8085 processor the HOLD and HLDA pin is used for _________.

Memory Interfacing

8259 Interfacing

DMA Interfacing

Co-processor Interfacing

Q28. In 8085 A microprocessor, the operation performed by the instruction LHLD 2100H is

(H) \(\leftarrow\) 21 H,(L) \(\leftarrow\) 00 H

(H) \(\leftarrow\) M (2100 H), (L) \(\leftarrow\) M (2101 H)

(H) \(\leftarrow\) M (2101 H), (L) \(\leftarrow\) M (2100 H)

(H) \(\leftarrow\) 00 H,(L) \(\leftarrow\) 21 H

Q29. When the RST 5.5 interrupt occurs in the 8085 microprocessor, the program is transferred to memory location ____.

\(003C\)

\(0034\)

\(0024\)

\(002C\)

Q30. In three byte instruction third byte stores ______.

Higher order address

Opcode

Lower Order Address

operand

MCQ

MICROPROCESSOR AND MICROCONTROLLER INTERFACING