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The high-performance, low-power 8/16-bit AVR XMEGA microcontroller combines 32KB in-system programmable flash memory (4KB boot code section) with read-while-write capabilities, 1KB EEPROM, 4KB SRAM, four-channel event system, a programmable multi-level interrupt controller, 34 general purpose I/O lines, a 16-bit real time counter, four flexible 16-bit timer/counters with capture, compare and PWM channels, USB Full-speed Device, two USARTs, two Two-Wire Interfaces (TWIs), two Serial Peripheral Interfaces (SPIs), one 12-channel/12-bit ADC with programmable gain, two analog comparators with window mode, a programmable watchdog timer with separate internal oscillator, accurate internal oscillators with PLL and prescaler, and programmable brown-out detection.