High-performance, low-power Atmel AVR 8-bit microcontroller family nAdvanced RISC architecture – 131 powerful instructions – Most single clock cycle execution – 32 x 8 general purpose working registers – Fully static operation – Up to 20 MIPS throughput at 20MHz – On-chip 2-cycle multiplier nHigh endurance non-volatile memory segments – 4/8/16/32KBytes of in-system self-programmable Flash program memory – 256/512/512/1KBytes EEPROM – 512/1K/1K/2KBytes internal SRAM – Write/erase cycles: 10,000 Flash/100,000 EEPROM – Data retention: 20 years at 85°C/100 years at 25°C – Optional boot code section with independent lock bits nIn-system programming by on-chip boot program enabling true read-while-write operation nSoftware security programming locking nAtmel QTouch library support – Capacitive touch buttons, sliders and wheels – QTouch and QMatrix acquisition – Up to 64 sensing channels nPeripheral features – Two 8-bit timers/counters with separate prescalers and compare modes – One 16-bit timer/counter with separate prescaler, compare mode and capture mode – Real time counter with separate oscillator – Six PWM channels – 8-channel 10-bit ADC (TQFP and QFN/MLF packages) temperature measurement – 6-channel 10-bit ADC (PDIP package) temperature measurement – Programmable serial USART – Master/slave SPI serial interface – Byte-oriented 2-wire serial interface (Philips I2C compatible) – Programmable watchdog timer with separate on-chip oscillator – On-chip analog comparator – Pin change interrupts and wake-up nSpecial microcontroller features – Power-on reset and programmable brown-out detection – Internal calibrated oscillator – External and internal interrupt sources – Six sleep modes: idle, ADC noise reduction, power-save, power-down, standby and extended standby nI/O and packages – 23 programmable I/O lines – 28-pin PDIP, 32-pin TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF