Jawaharlal Nehru Technological University Hyderabad B.Tech IV Year EMBEDDED SYSTEM DESIGN Previous Question Paper (October/November - 2020 - R16)

Embedded systems are classified based on performance, functional requirements, and complexity:

• Small-scale embedded systems: Designed for simple tasks, usually 8-bit or 16-bit microcontrollers, with limited hardware and software resources. Example: Electronic toy.
• Medium-scale embedded systems: Use 16-bit or 32-bit microcontrollers or DSPs, involving more complex hardware and software, often requiring an RTOS. Example: Industrial control system.
• Sophisticated embedded systems: High-end hardware like FPGAs, ASICs, or multi-core processors, running complex operating systems. Example: Smartphone.
• Standalone embedded systems: Function independently without a host computer. Example: Digital camera.
• Real-time embedded systems: Strictly time-constrained, divided into Hard Real-Time (failure leads to catastrophe) and Soft Real-Time (minor delays are acceptable). Example: Airbag control system.
• Networked embedded systems: Connected to a network to provide distributed intelligence. Example: Home automation system.
• Mobile embedded systems: Portable devices with limited power and memory. Example: Wearable fitness tracker.

The primary purpose of an embedded system is to perform a specific, dedicated function within a larger mechanical or electrical system. Unlike general-purpose computers, they are optimized for efficiency, reliability, and cost-effectiveness.

Key purposes include:

• Data Collection and Processing: Gathering sensor data and performing real-time analysis to make automated decisions.
• Control and Automation: Managing hardware components to maintain desired states, such as temperature or speed control.
• Communication: Facilitating data exchange between devices or systems over various protocols.
• Resource Efficiency: Operating within strict constraints of power, memory, and physical size while maintaining high performance.
• Reliability: Providing consistent, predictable performance in harsh or mission-critical environments where human intervention is not feasible.