ATMEGA328P-PU Microcontroller with ARDUINO UNO R3 Bootloader ATMEGA328P-PU 28DIP is a 8-bit AVR RISC-based microcontroller combines 32 KB ISP Flash memory with read-while-write capabilities, 1024B EEPROM, 2 KB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented Two-Wire serial interface, SPI serial port, a 6-channel 10-bit A/D converter (8-channels in TQFP and QFN/MLF packages), programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The device operates between 1.8-5.5 volts. Specifications : High Performance, Low Power Design 8-Bit Microcontroller Atmel AVR advanced RISC architecture 131 Instructions most of which are executed in a single clock cycle Up to 20 MIPS throughput at 20 MHz 32 x 8 working registers 2 cycle multiplier Memory Includes 32KB of of programmable FLASH 1KB of EEPROM 2KB SRAM 10,000 Write and Erase Cycles for Flash and 100,000 for EEPROM Data retention for 20 years at 85°C and 100 years at 25°C Optional boot loader with lock bits In System Programming (ISP) by via boot loader True Read-While-Write operation Programming lock available for software security I/O and Package 23 programmable I/O lines 28 pin DIP Operating voltage:1.8 – 5.5V Operating temperature range:40°C to 85°C Speed Grades: 0-4 MHz at 1.8-5.5V 0-10 MHz at 2.7-5.5V 0-20 MHz at 4.5-5.5V Low power consumption mode at 1.8V, 1 MHz and 25°C: Active Mode: 0.3 mA Power-down Mode: 0.1 μA Power-save Mode: 0.8 μA (Including 32 kHz RTC