Basic of Embedded System

|Embedded system|Any device that include a computer but is not itself a general purpose computer.

It includes both hardware & software which is part of some larger system & expected to work without human intervention.

Also it is expected to respond ,monitor, control external environment using sensor & actuators.

|Simplest Model of Embedded system|

|Example|

·        Printer

·        Cell phone

·        Automobile : engine, brakes, dash, etc.

·        Television

·        Household appliances

·        Surveillance  system

& many more…….

|Characteristic of embedded system|

Ø REAL TIME OPERATION (Always)

      “i.e the operation or task must be completed within the DEADLINES. Two kinds of real time operation:: 1. HARD REAL TIME (In this if a deadline is missed, it will result in a catastrophe)  2.SOFT REAL TIME (In this if a deadline is missed, it will only degrade the performance of system rather than destroying the whole system)”.

Ø SOPHISTICATED FUNCTIONALITY

“Degree of sophistication is vary from device to device”.

Ø LOW MANUFACTURING COST

“non-recurring engineering cost for design and development & cost of production as well as marketing per unit”

Ø APPLICATION DEPENDENT PROCESSOR (ASIC)

Ø RESTRICTED MEMORY

Ø LOW POWER

“power consumption is critical in battery operated device.”

|Complex model of embedded system|