Microcontroller, and modern ARM Cortex cores., Slides of Microprocessors

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INTRODUCTION

TO

MICROPROCESSOR/MICROCONTROLLER

SYSTEM

WEEK 2

Digital Electronics 2: Microprocessor and Micro-controller Systems And Design

LEARNING OUTCOMES

• Differentiate kinds/types of microprocessor and microcontroller systems
• Describe the Architecture/Organization of microprocessor/microcontroller systems
• Develop a clear understanding of the basic operation and characteristics of

microprocessor/microcontroller systems

MICROPROCESSOR

MICROPROCESSOR How a Microprocessor Works? The operation of a microprocessor follows a fetch–decode–execute cycle: 1.Fetch

1. The microprocessor retrieves an instruction from memory (RAM).
2. This instruction is stored in the Instruction Register. 2.Decode
3. The Control Unit (CU) interprets the instruction.
4. It determines whether the instruction involves arithmetic, logic, or data transfer. 3.Execute
5. The Arithmetic Logic Unit (ALU) performs the required operation (e.g., addition, comparison).
6. Results are stored in registers or sent back to memory/output devices. 4.Repeat
7. The cycle continues billions of times per second, driven by the clock speed (measured in GHz).

MICROPROCESSOR Key Components

• ALU (Arithmetic Logic Unit): Handles mathematical and logical operations.
• CU (Control Unit): Directs the flow of data and instructions.
• Registers: Small, fast storage locations inside the processor.
• Clock: Synchronizes operations, determining how fast instructions are processed.
• Bus System: Transfers data between processor, memory, and peripherals.

MICROPROCESSOR Comparison: Microprocessor vs CPU

MICROPROCESSOR The Chef Analogy Think of a microprocessor as a chef in a busy kitchen: 1.Fetch (Getting the recipe step)

1. The chef reads the next step from the recipe book (like the processor fetching an instruction from memory). 2.Decode (Understanding the step)
2. The chef interprets what the step means: “Chop onions” or “Boil water” (like the control unit decoding the instruction). 3.Execute (Doing the step)
3. The chef actually chops the onions or boils the water (like the ALU performing the operation). 4.Store (Saving the result)
4. The chopped onions are placed in a bowl, ready for the next step (like storing results in registers or memory). 5.Repeat
5. The chef keeps going step by step until the dish is complete (like the processor repeating the cycle billions of times per second).

ARM-BASED PROCESSOR An ARM-based processor is a type of CPU built on the ARM architecture, known for its energy efficiency, scalability, and widespread use in devices ranging from smartphones to servers. Unlike traditional x processors from Intel or AMD, ARM chips use a simplified instruction set (RISC), which allows them to deliver high performance per watt, making them ideal for mobile and power-conscious computing.

ARM-BASED PROCESSOR Common Uses

• Mobile Devices: Nearly all modern smartphones and tablets (Apple A-series, Qualcomm Snapdragon).
• IoT & Embedded Systems: Smart home devices, wearables, sensors.
• Gaming Consoles: Nintendo Switch uses ARM-based chips.
• Servers & Cloud Computing: Increasing adoption in data centers (e.g., Amazon Graviton processors).
• PCs & Laptops: Apple’s M1/M2/M3 chips are ARM-based, powering MacBooks with high efficiency.

ARM-BASED PROCESSOR Comparison: ARM vs x86 Processors Trade-Offs & Considerations

• Software Compatibility: Some desktop applications are optimized for x86, so ARM-based PCs may face compatibility issues (though emulation and native support are improving).
• Performance Gap: While ARM excels in efficiency, high-end x86 chips can still outperform in raw computing tasks.
• Adoption Trend: ARM is rapidly expanding beyond mobile into servers and PCs, challenging x dominance.

MICROCONTROLLER Evolution Key Technological Advancements Integration: Shifting from multiple, separate chips to a single system-on-a-chip (SoC) that includes memory (RAM/ROM), Timers, and ADC/DAC converters. Memory Technology: Evolution from ROM/PROM to erasable EEPROM and flash memory, allowing for on-site, in-system programming (ISP). Performance: Drastic increases in speed and data handling, enabling complex, real-time decision- making. Power Efficiency: Optimized for low-power, battery-operated devices, vital for the internet of things (IoT) and wearable technologies. Security: Inclusion of hardware acceleration for cryptography, secure boot, and secure memory access.

MICROCONTROLLER How It Differs from a Microprocessor Key Features

• Processor (CPU): Executes instructions and makes decisions.
• Memory: Includes both program memory (ROM/Flash) and data memory (RAM).
• Input/Output (I/O) Ports: Interfaces with sensors, switches, displays, motors, and other devices.
• Peripherals: Often includes timers, analog-to-digital converters (ADC), communication modules (UART, SPI, I²C), and more.
• Low Power Consumption: Designed for efficiency, often used in battery-powered devices. Everyday Examples
  • Remote controls
  • Washing machines
  • Car engine control units (ECUs)
  • Smart home devices (thermostats, smart locks)
  • Toys and gadgets

• END OF WEEK 2- 19