Embedded system is a combination of software and hardware designed and programmed to perform one/more particular task(s). the hardware is designed for specific application and then software is embedded in this hardware to perform the task. both software and hardware are dedicated to that particular application. The heart of the system is either processor or controller. Processor / controller may be general purpose or special purpose that controls whole system. there may be more then one processor/controller if system is complex. it may be possible that there is one general purpose processor / controller and one or more special purpose processors / controllers.
For example in 3G (or 4G) cell phones there is one general purpose processor that handles user commands, memory and display etc. And there are special purpose processors like DSP for voice communication and network management, display controller to generate real and reach images on color LCD screen.
89C51\52, 89S51\52 based Projects
