Atmel Corporation ATMEGA1284P-MUR Connectivity: I??C, SPI, UART/USART Core Processor: AVR Core Size: 8-Bit Data Converters: A/D 8x10b Eeprom Size: 4K x 8 Number Of I /o: 32 Operating Temperature: -40?°C ~ 85?°C Oscillator Type: Internal Package / Case: 44-VQFN Exposed Pad Peripherals: Brown-out Detect/Reset, POR, PWM, WDT Program Memory Size: 128KB (64K x 16) Program Memory Type: FLASH Ram Size: 16K x 8 Series: AVR?® ATmega Speed: 20MHz Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V Product Category: 8-bit Microcontrollers - MCU RoHS: yes Core: AVR Data Bus Width: 8 bit Maximum Clock Frequency: 20 MHz Data RAM Size: 16 KB On-Chip ADC: Yes Operating Supply Voltage: 1.8 V to 5.5 V Maximum Operating Temperature: + 85 C Mounting Style: SMD/SMT Data ROM Size: 4 KB Interface Type: 2-Wire, SPI, USART Minimum Operating Temperature: - 40 C Number of Programmable I/Os: 32 Number of Timers: 3 Processor Series: megaAVR Factory Pack Quantity: 4000 Supply Voltage - Max: 5.5 V Supply Voltage - Min: 1.8 V