BCA Semester 2 – Microprocessor and Comp. Architecture – Unit 1: Fundamental of Microprocessor (5Hrs)

Bus Organization of 8085 The 8085 microprocessor uses three main buses to communicate with memory and I/O devices: 1. Address Bus - Unidirectional (only from CPU → memory). - 16-bit wide → c

Introduction The 8085 microprocessor is an 8-bit microprocessor with a 40-pin IC. Its internal architecture contains several functional blocks that work together to execute instructions, perform ari

1. Definition of Instruction Cycle An instruction cycle is the complete process by which a microprocessor fetches, decodes, and executes an instruction. It consists of three main steps: 1. Fetch – R

1. Definition of Instruction Set An instruction set is the collection of all instructions that a microprocessor can execute. Each instruction tells the CPU to perform a specific operation like data

Define Addressing Mode Addressing Mode defines the method by which the operand of an instruction is specified. It tells the CPU where to find the data to be used in an operation — whether in a regis

Addressing Modes of 8085 Definition: An addressing mode defines the method by which an operand of an instruction is specified. It tells the CPU where to find the data to perform an operation: in a

Timing Diagram for MVI A, 35H Instruction: MVI A, 35H Opcode: 3EH Purpose: Load immediate data 35H into accumulator A. --- Steps of Execution 1. Opcode Fetch (1st Machine Cycle) - T1: Place

Characteristics of CISC Instruction Set Architecture CISC (Complex Instruction Set Computer) is a CPU design philosophy where the instruction set contains a large number of complex instructions. Each

1. Definition of Flag Flag: A flag is a single-bit indicator used to show the status of an operation in the CPU. Uses of Flags: - Indicate results of arithmetic or logical operations (e.g., zero, ca

Instruction: LXI H, 5070H Purpose: Load the 16-bit immediate data (5070H) into H-L register pair. Opcode: 21H Instruction Size: 3 Bytes (Opcode + Low Byte + High Byte) --- Execution Steps 1. O

Comparison between 8085 and 8086 Microprocessors | Feature | 8085 | 8086 | |-------|---------|---------| | Word Size | 8-bit | 16-bit | | Data Bus | 8-bit | 16-bit | | Address Bus | 16-bit | 20-bit |