A micro-controller is a single Integrated Circuit (IC) which is comparable to a little stand alone computer and it is designed to perform the specific tasks of embedded systems. A micro-controller contains processing unit but small amount of memory (ROM, RAM etc.), few IO ports for peripherals, timer etc. AVR and ARM comes under the family of micro-controller. But ARM can be used as both Microcontroller or as Microprocessor. ARM micro-controller and AVR micro-controller differs from each other in terms of different architecture and different sets of instruction, speed, cast, Memory, Power Consumption, Bus Width etc. Now let’s understand in detail how they differs from each other.

1. AVR micro-controller :
AVR micro-controller is manufactured by Atmel corporation in the year 1996. It is based on RISC Instruction set Architecture (ISA) and also called as Advanced Virtual RISC. AT90S8515 was the initial micro-controller belongs to AVR family. AVR micro-controller is most popular category of controller and it is cheap. It is used in many robotic applications.

2. ARM micro-controller :
ARM micro-controller was introduced by Acorn computer organization and is manufactured by Apple, Nvidia, Qualcomm, Motorola, ST Microelectronics, Samsung Electronics, and TI etc. It is based on RISC Instruction set Architecture (ISA) and also called as Advanced RISC Micro-controller. It is most popular micro controller and most industries use it for embedded systems as it provides a large set of features and is good to produce devices with excellent appearances.
3. X86:
x86 processors are familiar to many in IT because this is the type of processor used in most computer and server hardware. In an architectural sense, the hardware components within an x86 system–like sound and graphics cards, memory, storage, and the CPU–are all independent of each other. Most components have separate chips called controllers. Components can be changed or expanded without affecting connectivity or the overall hardware platform.
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