A microcontroller (also MCU or µC) is a computer-on-a-chip, containing a processor, memory, and input/output functions. It is a microprocessor emphasizing high integration, in contrast to a general-purpose microprocessor (the kind used in a PC). In addition to the usual arithmetic and logic elements of a general purpose microprocessor, the microcontroller integrates additional elements such as read-write memory for data storage, read-only memory for program storage, EEPROM for permanent data storage, peripheral devices, and input/output interfaces. Below is a list of microcontroller suppliers.

• AMD
• Intel
• Microchip
• Texas Instruments
• IDT
• National Semiconductor
• NEC
• STMicroelectronics
• Samsung
• Sun Microelectronics
• Toshiba
• Fairchild