– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby – External and Internal Interrupt Sources – Power-on Reset and Programmable Brown-out Detection – Programmable Watchdog Timer with Separate On-chip Oscillator – Six/Twelve PWM Channels with Programmable Resolution from 2 to 16 Bits (ATmega1281/2561, ATmega640/1280/2560) – Real Time Counter with Separate Oscillator – Four 16-bit Timer/Counter with Separate Prescaler, Compare- and Capture Mode – Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode – Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface – Boundary-scan Capabilities According to the JTAG Standard – Capacitive touch buttons, sliders and wheels Endurance: Up to 64Kbytes Optional External Memory Space.In-System Programming by On-chip Boot Program.– Optional Boot Code Section with Independent Lock Bits – Data retention: 20 years at 85C/ 100 years at 25C – 64K/128K/256KBytes of In-System Self-Programmable Flash High Endurance Non-volatile Memory Segments.– 32 × 8 General Purpose Working Registers – 135 Powerful Instructions – Most Single Clock Cycle Execution High Performance, Low Power Atmel® AVR® 8-Bit Microcontroller.By executing powerful instructions in a single cloc k cycle, the ATmega640/1280/1281/2560/2561 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The ATmega640/1280/1281/2560/2561 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture.

Arduino uno mega 2560 datasheet