ECE · all questions

Microprocessors And Microcontrollers
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Q221

A microcontroller differs from a microprocessor in terms of

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Q222

Consider the following 8085 interrupts:
1. TRAP
2. INTR
3. RST 6
4. RST 7.5
5. RST 0
The software interrupt are

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Q223

Match List-I with List-II and select the correct answer using the options given below the lists:

List-I (Pre terminals)	List-II (Applications)
a. SID, SOD	1. Wait state
b. Ready	2. Interrupt
c. TRAP	3. Serial data transfer
d. ALE	4. Memory of I/O read/wire
	5. Address latch control

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Q224

Define the type of instruction with its addressing mode. (8086 ALP) IN AX, 04H

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Q225

Consider the following 8085 instructions:
MVI A, A9H
MVI B, 57H
ADD B
ORA A
The flag status (S, Z, CY) after the instruction ORA A is executed, is

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Q226

Consider the following:
1. Sign Flag
2. Zero Flag
3. Carry Flag
4. Parity Flag
Which of the above flags of 8085 get affected by the instruction SUB B?

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Q227

In a microprocessor, when a CPU is interrupted, it

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Q228

Consider the following statements:
The SIM instruction outputs the contents of accumulator to define:
1. Interrupt mask bit.
2. Interrupt pending bit.
3. Serial input data line.
4. Serial output data line.
Which of the statements given above are correct?

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Q229

A microprocessor with 12-bit address bus will be able to access . . . . . . . . kilobytes of memory.

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Q230

Which one of the following interrupts is both level and edge sensitive?

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Q231

Which one of the following is NOT a vectored interrupt?

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Q232

Consider the following statements regarding programmable interrupt controller 8259A:
1. 8259A is specifically designed for use with the interrupt signals (INTR/INT) of 8085 microprocessor.
2. It can solve eight levels of interrupt priorities in a variety of modes.
3. With additional 8259A devices, the priority scheme can be expanded to 32 levels.
Which of the above statement is/are not correct?

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Q233

Which one of the following addressing modes is used to compute the address of the operand by adding a constant value to the content of a register?

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Q234

For 8085 microprocessor, the instruction RST 6 restarts subroutine at address:

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Q235

In 8085 microprocessor system, the direct addressing instructions is

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Q236

PUSH a
PUSH b
PUSH c
POP AX
POP BX
SUB AX, BX
POP BX
ADD AX, BX
The expression computed by the above program and stored in AX is

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Q237

In IC 8085 Microprocessor TRAP interrupt ISR is at which memory address?

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Q238

The output data lines of microprocessor and memories are usually tristated, because:

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