Embedded Systems : an introduction

Embedded systems, unlike that of a general purpose computer (performing variety of task), is a scaled down computer system, contained on a single chip having both hardware and firmware, designed to perform operation to minimize human control.

DEFINITION:

an embedded system is special purpose computer system designed to perform one or a few dedicated function, often with real time computer constraints.

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APPLICATION OF EMBEDDED SYSTEM:

Embedded system is also a control system

• pen drives
• hard disk
• air conditioner
• printer
• mouse
• fan
• digital camera
• automobile system
• cell phone

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Types of embedded system:

NON REAL TIME EMBEDDED SYSTEM is one in which there is no deadline, thus high performance or fast response is preferred.

example:

• security system
• mobile and PDA
• alarm system
• digital camera

REAL TIME EMBEDDED SYSTEM : where deadline is to be met ie task is to performed within time limit.

• sensor system in nuclear plant
• missile defense system
• flight control system
• anti collision system in auto mobile.