MICRO CONTROLLER

A micro controller is a small computer on a single chip IC containing a processor,memory and programmable input and output. Program memory in the form of NOR Flash is also often included on chip,as well as a typically small amount of RAM. Micro controller are designed for embedded applications,in contrast to the microprocessors used in personal computer.

Micro controller are used in automatically controlled products and device.By reducing the size and cost compared to a design that uses a separate processors,memory.Mixed signal micro controller are common,integrating analog components needed to control non-digital electronic systems.

Some micro controller may use four bit words and operate at clock rate frequencies as low as 4 kHZ ,low power consumption. They will generally have the ability to retain functionality while waiting for an event such as button press or other interrupt.

Other micro controller may serve performance critical roles,where they may need to act more like a digital signal processing with higher clock speeds and power consumption.A micro controller can be considered  a self contained system with a processor , memory and can be embedded system is used.

The majority of micro controller in use today are embedded in other machinery,such as automobiles,telephones,appliances and peripherals for computer systems.

TYPES OF MICRO CONTROLLER

1.ARM core processor 

2.ATMEL AVR

3.Intel 8051

4.Power pc

5.Rabbit 2000

6.Toshiba TLCS-870