A CDE Definition
A single chip that contains the processor (the CPU), non-volatile memory for the program (ROM or flash), volatile memory for input and output (RAM), a clock and an I/O control unit. Available in numerous sizes and architectures, and also called a "computer on a chip," billions of microcontroller units (MCUs) are embedded each year in products from toys to appliances to automobiles. For example, modern cars and trucks employ several dozen microcontrollers in their various driving and safety systems (see embedded system and automotive systems). See CPU, RAM, ROM and clock.
Motorola 6801 - One of the First
They Don't Get Much Smaller
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