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Microprocessors And Microcontrollers
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Q201

Consider the following statements:
1. A total of about one million bytes can be directly addressed by the 8086 microprocessor.
2. The 8086 has thirteen 16-bit registers.
3. The 8086 has eight flags.
4. Compared to 8086, the 80286 provides a higher degree of memory protection.
Of these statements

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Q202

Which one of the following control bits of 8086 flag register is used to put the 8086 in single step mode?

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Q203

The 8255 programmable peripheral interface consist of . . . . . . . . 8-bit ports

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Q204

Which one of the following instructions in a stack computer consists of an operation code only with no address field?

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Q205

Which is internal RAM address of SBUF in 8051?

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Q206

The 8085 supports . . . . . . . . number of instructions, with . . . . . . . . number of addressing modes and operates at . . . . . . . . MHz frequency.

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Q207

An array processor is a . . . . . . . . Machine

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Q208

Which one of the following is not an arithmetic instruction?

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Q209

The addressing expression in 8086, "MOV count, 100H" is an example of . . . . . . . .

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Q210

What is the address space of 8086 CPU?

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Q211

Identify the mathematical function that is performed by the following instructions.
MVI A, 07H
RLC
MOV B, A
RLC
RLC
ADD B

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Q212

A 8255 chip is selected when A2 to A7 bits are all 1. The address of port C

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Q213

Consider the following loop:
MOV CX, 8000H
L1 : DEC CX
JNZ L1
The processor is running at 14.7456/3 MHz and DEC CX requires 2 clock cycles and JNZ requires 16 clock cycles. The total time taken is nearly

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Q214

Consider the following registers:
1. Accumulator and B register
2. B and C registers
3. D and E registers
4. H and L registers
Which of these 8-bit registers of 8085 µP can be paired together to make a 16-bit register?

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Q215

What will be the content of Accumulator, Register-B and Overflow flag (OV) after execution of following 8051 micro-controller assembly code?
MOV A, #65h
MOV 0F0h, #14h
DIV AB
DIV AB

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Q216

The stack pointer will be affected by instruction:
1. PUSH PSW
2. CALL ADDR
3. XTHL
4. RST n

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Q217

What is the RAM and ROM size in 8051 microcontroller?

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Q218

What is the maximum number of key codes that can be generated by 8279?

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Q219

8251 IC is a

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Q220

How many bytes of bit addressable memory is present in 8051 based microcontrollers?

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