Podcast
Questions and Answers
What role does the Accumulator (A) play in the Intel 8085 microprocessor?
What role does the Accumulator (A) play in the Intel 8085 microprocessor?
- Main register for arithmetic operations. (correct)
- Stores memory addresses.
- Keeps track of the stack's height.
- Coordinates data transfer between peripherals.
Which of the following pairs represents general-purpose registers in the Intel 8085 microprocessor?
Which of the following pairs represents general-purpose registers in the Intel 8085 microprocessor?
- H and PC
- A and PC
- B and C (correct)
- A and SP
What function does the Control Unit (CU) perform in the Intel 8085 microprocessor?
What function does the Control Unit (CU) perform in the Intel 8085 microprocessor?
- Executes all arithmetic operations.
- Coordinates operations within the CPU. (correct)
- Stores data temporarily during computation.
- Facilitates I/O data transfers.
Which register in the Intel 8085 keeps track of the memory address for the next instruction to be executed?
Which register in the Intel 8085 keeps track of the memory address for the next instruction to be executed?
What is the primary purpose of the Input/Output (I/O) ports in the Intel 8085 microprocessor?
What is the primary purpose of the Input/Output (I/O) ports in the Intel 8085 microprocessor?
What does the MOV instruction do in programming?
What does the MOV instruction do in programming?
Which addressing mode uses registers as pointers to memory locations?
Which addressing mode uses registers as pointers to memory locations?
What does the Zero Flag indicate after an arithmetic operation?
What does the Zero Flag indicate after an arithmetic operation?
What is the function of an Interrupt Service Routine (ISR)?
What is the function of an Interrupt Service Routine (ISR)?
Which statement describes the limitation of an 8-bit architecture?
Which statement describes the limitation of an 8-bit architecture?
Which flag is used in Binary Coded Decimal (BCD) arithmetic?
Which flag is used in Binary Coded Decimal (BCD) arithmetic?
In terms of bus systems, what is the primary role of the Address Bus?
In terms of bus systems, what is the primary role of the Address Bus?
Which application is primarily suited for small embedded systems?
Which application is primarily suited for small embedded systems?
Flashcards
Accumulator (A)
Accumulator (A)
The main register in the Intel 8085 for performing arithmetic operations.
Arithmetic Logic Unit (ALU)
Arithmetic Logic Unit (ALU)
The part of the Intel 8085 that handles all arithmetic and logic operations, like addition, subtraction, AND, and OR.
Registers
Registers
Registers in the Intel 8085 used to temporarily store data. They come in different types with specific purposes.
Control Unit (CU)
Control Unit (CU)
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
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CPU (Central Processing Unit)
CPU (Central Processing Unit)
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Memory
Memory
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Instruction Set
Instruction Set
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Addressing Mode
Addressing Mode
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Flags
Flags
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Interrupt
Interrupt
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Interrupt Service Routine (ISR)
Interrupt Service Routine (ISR)
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Interrupt Vectors
Interrupt Vectors
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Study Notes
Introduction
- The Intel 8085 is an 8-bit microprocessor
- It's a complex set of interconnected circuits, all on one chip
- Designed for general-purpose use
- Popular in education and hobbyist projects
Architecture
- Registers: Stores data temporarily
- Accumulator (A): Main register for arithmetic operations
- B, C, D, E: General purpose registers, often used in pairs (BC, DE)
- H, L: General purpose registers, often used as a pointer, for address storage
- Stack Pointer (SP): Keeps track of the top of the stack
- Program Counter (PC): Holds the memory address of the next instruction to be executed.
- Arithmetic Logic Unit (ALU): Performs arithmetic and logic operations
- Control Unit (CU): Coordinates all operations within the CPU, retrieves instructions, and decodes them into smaller parts.
- Input/Output (I/O) Ports: Facilitate data transfer between the microprocessor and peripherals.
- Memory: Stores program instructions and data
- Holds both the program and the working data
- Memory can be read from and written to
Instruction Set
- MOV (Move): Transfers data between registers or between a register and memory
- MVI (Move Immediate): Moves data from an 8-bit immediate operand to a register
- LDA/STA (Load/Store Accumulator): Transfers data between the accumulator and memory
- ADD/SUB (Add/Subtract): Arithmetic operations on the accumulator
- IN/OUT: Input/Output operations
- JMP/CALL/RET: Control transfer instructions for program flow (jumps, calls, returns)
- JNZ/JZ/JC/JNC: Conditional jumps based on Zero, Carry flags
Addressing Modes
- Register Addressing: Operands are located in registers
- Immediate Addressing: Operands are directly within the instruction itself
- Direct Addressing: Operands are located in memory using the given memory address
- Register Indirect Addressing: Use registers as pointers to locations in memory
- Base + Displacement Addressing: Allows for addressing memory locations relative to a base register
Flags
- Carry Flag: Set if an arithmetic operation results in a carry out
- Zero Flag: Set if the result of an operation is zero
- Sign Flag: Based on the most significant bit of the result (useful for measuring large numbers)
- Parity Flag: Set if the result has an even number of 1s
- Auxiliary Carry Flag: Used in BCD (Binary Coded Decimal) arithmetic
Interrupts
- Interrupt: A signal that stops the CPU from its current execution to handle a certain event from outside the CPU.
- Interrupt Service Routine (ISR): A small program that handles a specific interrupt.
- Types of Interrupts: Internal and external interrupts
- Interrupt Vectors: Provide the starting address of the ISR for each interrupt
Pin Description
- Address Bus: Carries the memory address
- Data Bus: Carries the data between the CPU and memory or I/O devices
- Control Signals: Various signals, such as RD, WR, control operations
System Design
- Often used with RAM (Random Access Memory)
- Works with ROM (Read-Only Memory) for storing firmware
- May be part of a larger system including input/output devices
- Commonly used with hardware such as timers, display interfaces
Applications
- Small embedded systems
- Industrial control applications
- Educational purposes
- Hobbyist projects
Limitations
- Limited instruction set compared to more modern processors
- Less efficient for certain tasks
- 8-bit architecture might not be sufficient for advanced applications
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Description
This quiz covers the basic concepts of the Intel 8085 microprocessor, including its architecture and main components. It is designed for students and hobbyists interested in understanding the functions of various registers, the Arithmetic Logic Unit, and the Control Unit. Test your knowledge on this essential 8-bit microprocessor!