ATMEGA328P-PU MCU Microcontroller 8 AVR Singlechip Chip Description: This is ATMEGA328P-PU MCU microcontroller 8 AVR singlechip chip. To get this chip working with IDE， you will need an external 16MHz crystal or resonator， a 5V supply， and a serial connection. Atmel's ATMega328 8-Bit Processor in 28 pin DIP package. It's like the ATmega168， with double the flash space. 32K of program space. 23 I\/O lines， 6 of which are channels for the 10-bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. 1.8V to 5V operating voltage! Package included: 1 x ATMEGA328P-PU chip