New Atmega 328P-PU 28 Pins with Arduino UNO boot Loader ATMEL Hot Can be programmed to write your own programs (non-professionals do not operate) This will allow you to use code in your custom embedded project without having to use an actual board Runs up to 20MHz with external crystal Package can be programmed in circuit. 1.8V to 5V operating voltage! Architecture: 8-bit; Number of Pins: 28; Series: ATMega