Skip to main content

CPU Instruction Cycle and Micro-operations Study Guide

A comprehensive guide to the CPU instruction cycle, detailing each stage (Fetch, Decode, Execute, Writeback), the function of key registers (PC, IR, MAR, MDR, ALU), and the impact of micro-operations (uops) on modern processor performance, including pipelining and out-of-order execution.

Save this study guide to your study set

Sign up free

Your learning path

Microprocessor Bus Systems

Bus Architecture and Signal Integrity

Learn about address, data, and control buses, including multiplexing techniques, de-multiplexing with latches (ALE), and tri-state logic for signal management.

Instruction Cycle Mechanics

Deep dive into the Fetch-Decode-Execute-Writeback cycle, including the role of the Program Counter, Instruction Register, and micro-operations (uops) in modern architectures.

  • Instruction Cycle
  • Fetch Stage
  • Decode Stage
  • Execute Stage
  • Writeback Stage
  • Program Counter (PC)
  • Instruction Register (IR)
  • Memory Data Register (MDR)
  • Micro-operations (uops)
  • Pipelining
  • Out-of-Order Execution

Memory Operations and Data Handling

Understand the fetch-decode-execute cycle, memory alignment, byte-addressability, and the implications of endianness in data storage.

Endianness and Memory Alignment

Understand the physical layout of multi-byte data (Little-Endian vs Big-Endian) and the performance/hardware implications of memory alignment constraints.

I/O Interfacing and Peripheral Control

I/O Interfacing Architectures

Compare Memory-Mapped I/O (MMIO) and Isolated I/O (I/O-Mapped) architectures, focusing on address space utilization, instruction sets, and hardware complexity.

Bus Buffering and Signal Integrity

Learn about fan-out, bus buffers, and how to manage capacitive loading to ensure reliable signal transmission across the system.

Hardware-Software Synchronization Trace

Computer Architecture

Programmable Peripheral Interface (PPI) Configuration

Master the Programmable Peripheral Interface (PPI), including port structures (A, B, C), operational modes (0, 1, 2), and Control Word Register programming.

Make it your own.

Keep these readings and topics in a new study set, or add them to one you already use.

Get started freeLog in