• 16K bytes of in-system programmable Flash
• 1K bytes of SRAM data memory
• 256 bytes of EEPROM data memory
• 18 general purpose I/O lines
• 32 general purpose working registers
• An 8-bit timer/counter with two PWM channels
• A16-bit timer/counter with two PWM channels
• Internal and external interrupts
• A 10-bit ADC with 5 internal and 12 external channels
• An ultra-low power, programmable watchdog timer with internal oscillator
• Two programmable USART’s with start frame detection
• A slave Two-Wire Interface (TWI)
• A Universal Serial Interface (USI) with start condition detector
• A calibrated 8MHz oscillator
• A calibrated 32kHz, ultra low power oscillator
• Four software selectable power saving modes.