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8086 Microprocessor - Execution Unit and Registers

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8086 Microprocessor - Execution Unit and Registers

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Questions and Answers

What is the purpose of the Stack Pointer (SP) in 8086 microprocessor?

To differentiate between source and destination addresses in data string processing

To store the offset address in the current SS for based addressing mode

To automatically update BP contents during instruction execution

To access data in the stack segment as an offset from SS (correct)

Which register is used in 8086 microprocessor for based addressing mode?

Source Index (SI)

Destination Index (DI)

Base Pointer (BP) (correct)

Stack Pointer (SP)

In indexed addressing, which registers are used together with DS and ES?

Source Index (SI) and Destination Index (DI) (correct)

Base Pointer (BP) and Counter Register (CX)

Stack Pointer (SP) and Base Pointer (BP)

Source Index (SI) and Stack Pointer (SP)

What happens to SP contents due to the execution of POP or PUSH instructions?

SP contents are automatically updated by incrementing/decrementing Signup and view all the answers

Which register is used as an offset from the current SS in instructions involving the stack segment?

Stack Pointer (SP) Signup and view all the answers

What does the 8086 microprocessor do if a condition is not zero?

Branches to label START Signup and view all the answers

Which register always points to the next instruction to be executed within the currently executing code segment?

Instruction Pointer Signup and view all the answers

In based addressing mode, what is used to calculate the 20-bit physical stack address?

Base Pointer (BP) Signup and view all the answers

What is the role of the Base Pointer (BP) in stack instructions?

Calculates physical stack address in based addressing mode Signup and view all the answers

Which register is used along with Extra Segment (ES) to determine the 20-bit physical address for the destination in string instructions?

Destination Index (DI) Signup and view all the answers

What is the main function of the Stack Pointer (SP) in 8086 Microprocessor?

Calculates the 20-bit physical stack address Signup and view all the answers

The Counter Register (CX) is used as an offset for computation of which type of physical address?

Stack address Signup and view all the answers

What does the processor do each time it wants to access memory?

Takes the segment register value, shifts it one hexadecimal place to the left, and adds the required offset. Signup and view all the answers

Which register is used for code or instruction address purposes?

BX Signup and view all the answers

What is the purpose of Stack Pointer (SP)?

Stack address Signup and view all the answers

In the context provided, what is meant by 'Segment : Offset'?

Combination of a segment register and an offset to form a memory address Signup and view all the answers

Which combination of registers is used for string source address purposes?

BX, DI, SI Signup and view all the answers