Syatem

System us an arrangement in which all its units are assenbled to work together following a set of rules and regulations.

Embedded system

Embedded system is an combination of software and hardware which performs a particular task in a given time.Embedded systems performs a particulatask means it is designed onl yffor a task whcih requires specific hardware i.e. microcontrollers and specific software i.e. embeeded programming codes and to performa a task in a givien time “real time approach” is used.

Embedded systems are very common in our daily life, we are using many embedded systems such as television,refrigeator,mobiles,microwave ovan,scanners,printers,washing machines,watches,cars,caccum cleaners,water heaters.

Categories of embedded systems

Ther e are three categories of embedded system on the basis of size.They are:

Small scale embedded system

Small scale embedded systems are deisgned using 8-bit microcontrollers,complexity of hardware and software are very low in these systems,They are generally battery operated and power consumption is low,memory is also low so it requires less data to be processed.Operations are generally written in simple embedded C languge codes.Examples are temperature measurement system and robotic arm.

Medium scale embedded system

Medium scale embedded systems are deisgned using 8-16 bit microcontrollers.Complexity of hardware and software is high,power consumption is high,itrequires an real time operating system and digital processing system to operate with time boundations.Examples of medium scale embedded systems are atm,pager and fax machines.

Sophisticated scale embedded system

Sophisticated scale embedded systems are designed using 32 bit microcontrollers.Complexity of hardware and software is very high,power consumption is also very high,it also requires real time operating sysrem and digital processing system with rime boundation.Sophisticated scale embedded systems requires special tools to designed.Examples of these systems are smartphones and multimedia systems.