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The PIC16F84 is a microcontroller in the PIC family of controllers, produced by Microchip Technology.
It has serial communications, timer, and PIC I/O controls.
The PIC16F84 is popular in many hobbyist applications because it uses a serial programming algorithm that lends itself to very simple programmers. Additionally, it uses flash memory, so it's easy to erase and requires no special tools to do so. It also has EEPROM for storage of user data.