Single chip microcomputers are also referred to as microcontrollers. The microcontrollers are typically used for dedicated applications such as automotive systems, home appliances and home entertainment systems. Typical microcontrollers therefore include on chip timers, A/D and D/A converters. Two popular microcontrollers are intel 875 and Motorola HC16. The 16- bit microcontrollers include more on chip ROM, RAM and I/O compared to the 8 bit microcontrollers.