Microprocessor 8085 Architecture Quiz

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Questions and Answers

What is the role of the stack pointer register in a microprocessor?

Provides timing and control signals to the microprocessor

Decodes the information present in the Instruction register

Holds temporary data of arithmetic and logical operations

Works like a stack and is always incremented/decremented by 2 during push and pop operations (correct)

Which register holds the temporary data of arithmetic and logical operations in a microprocessor?

Stack pointer register

Temporary register (correct)

Flag register

Instruction register

What is the purpose of the flag register in a microprocessor?

Decodes the instructions fetched from memory

Stores 1-bit flip-flops depending upon the result stored in the accumulator (correct)

Provides timing and control signals to the microprocessor

Holds the temporary data of arithmetic and logical operations

Which of the following signals is NOT categorized as a timing and control signal that controls external and internal circuits in a microprocessor?

RESET OUT Signup and view all the answers

What is the main function of the instruction decoder in a microprocessor?

Decodes the instructions present in the Instruction register Signup and view all the answers

When an interrupt occurs during the execution of a main program on a microprocessor, what action does the microprocessor take?

Shifts control from main program to process the incoming request Signup and view all the answers

What is the configuration of the 8085 microprocessor in terms of address bus and data bus?

16-bit address bus and 8-bit data bus Signup and view all the answers

What is the purpose of the Accumulator in the 8085 microprocessor?

To perform arithmetic, logical, I/O & LOAD/STORE operations Signup and view all the answers

Which functional unit of the 8085 microprocessor is responsible for performing arithmetic and logical operations on 8-bit data?

Arithmetic and logic unit Signup and view all the answers

How many general purpose registers are there in the 8085 microprocessor?

6 Signup and view all the answers

What is the function of the program counter in the 8085 microprocessor?

To hold the memory address of the next instruction to be executed Signup and view all the answers

Which pair of general purpose registers in the 8085 processor can hold 16-bit data?

D-E Signup and view all the answers

What are the 5 interrupt signals in 8085 microprocessor?

INTR, RST 7.5, RST 6.5, RST 5.5, TRAP Signup and view all the answers

Which instructions control the serial data communication in 8085 microprocessor?

SID and SOD Signup and view all the answers

What is loaded into the address buffer and address-data buffer to communicate with the CPU?

Content stored in the stack pointer and program counter Signup and view all the answers

How does the data bus differ from the address bus in 8085 architecture?

Data bus is bidirectional while address bus is unidirectional Signup and view all the answers

Which buses allow the CPU to exchange desired data with memory and I/O chips?

Memory and I/O chips are connected to address and data buses Signup and view all the answers

Study Notes

Role of the Stack Pointer Register

The stack pointer register holds the address of the top of the stack in memory, facilitating function calls and local variable storage.

Register for Temporary Data

The Accumulator register temporarily stores data during arithmetic and logical operations, acting as an essential intermediary in calculations.

Purpose of the Flag Register

The flag register indicates the status of the CPU and the outcome of operations through condition flags (e.g., zero, carry, sign flags) which inform the execution of future instructions.

Non-Timing Control Signals

An example of a signal that is not categorized as a timing control signal would be data transfer signals, which focus on communication rather than timing.

Function of the Instruction Decoder

The instruction decoder interprets the fetched instruction and translates it into control signals that direct other parts of the microprocessor to execute the instruction.

Action on Interrupt Occurrence

Upon an interrupt, the microprocessor pauses the current execution, saves the context of the program, and initiates the execution of an interrupt service routine.

Configuration of the 8085 Microprocessor

The 8085 microprocessor has a 16-bit address bus capable of addressing 64 KB of memory and an 8-bit data bus for data transfer.

Purpose of the Accumulator in the 8085 Microprocessor

The Accumulator is used primarily for arithmetic operations and logical operations, functioning as the primary data register for calculations.

Functional Unit for Arithmetic and Logical Operations

The Arithmetic Logic Unit (ALU) is responsible for performing all arithmetic and logical operations on 8-bit data within the 8085 microprocessor.

General Purpose Registers in the 8085 Microprocessor

There are six general-purpose registers in the 8085 microprocessor, labeled as B, C, D, E, H, and L, which are used for temporary data storage during operations.

Function of the Program Counter

The program counter keeps track of the address of the next instruction to be executed, ensuring sequential execution of programs.

Pair of General Purpose Registers for 16-bit Data

The H-L register pair and the D-E register pair can hold 16-bit data, allowing for larger data manipulation within the 8085 architecture.

Interrupt Signals in the 8085 Microprocessor

The five interrupt signals in the 8085 microprocessor include RST7.5, RST6.5, RST5.5, TRAP, and INTR, facilitating external event handling.

Instructions for Serial Data Communication

The OUT and IN instructions control serial data communication, enabling data exchange between the microprocessor and peripheral devices.

Data Communication Buses

The address buffer stores addresses while the data bus communicates actual data between the CPU and memory or I/O devices.

Difference Between Data Bus and Address Bus

The data bus is used for transferring data, whereas the address bus carries addresses to specify where data should be read from or written to in memory.

Buses for CPU Communication

The address bus, data bus, and control bus are utilized by the CPU to exchange desired data with memory and I/O chips, coordinating system operations.

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Description

Test your knowledge of the 8085 microprocessor architecture, including its 8-bit design, 16-bit address bus, program counter, stack pointer, registers, and operating specifications. Learn about its applications in various electronic devices.