Advantages of microprocessors versus discrete digital electronics in appliance controls

The use of 4, 8, and 16 bit microprocessors versus discrete digital electronics in appliance controls is discussed. The categories set forth are not intended to describe all microprocessor parts available, but rather to address general microprocessor technologies. Simple controllers that can compete in applications typically relegated to switches and mechanical timers are discussed, as well as more complex controllers such as those providing novel and useful features for top-of-the-line appliances. Guidelines are assembled for use in choosing the right processor for the job. A typical microprocessor-based control project life, from concept to finished product, is discussed. The costs associated in microprocessor design, development, and modification during the embryonic phase are addressed. The use of microprocessor technology versus discrete digital circuitry results in reduced parts count, smaller circuit boards, improved performance/reliability, potential cost reductions, increased flexibility, and decreased response times