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• High Performance, Low Power AVR® 8-Bit Microcontroller • Advanced RISC Architecture 135 Powerful Instructions Most Single Clock Cycle Execution 32 x 8 General Purpose Working Registers Fully Static Operation Up to 16 MIPS Throughput at 16 MHz On-Chip 2-cycle Multiplier • Non-volatile Program and Data Memories 64K/128K/256K Bytes of In-System Self-Programmable Flash Endurance: 10,000 Write/Erase Cycles Optional Boot Code Section with Independent Lock BitsIn-System Programming by On-chip Boot Program True Read-While-Write Operation 4K Bytes EEPROM Endurance: 100,000 Write/Erase Cycles 8K Bytes Internal SRAM Up to 64K Bytes Optional External Memory Space Programming Lock for Software Security • JTAG (IEEE std. 1149.1 compliant) Interface Boundary-scan Capabilities According to the JTAG Standard Extensive On-chip Debug Support Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface • Peripheral Features Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode Four 16-bit Timer/Counter with Separate Prescaler, Compare- and Capture Mode Real Time Counter with Separate Oscillator Four 8-bit PWM Channels Six/Twelve PWM Channels with Programmable Resolution from 2 to 16 Bits (ATmega1281/2561, ATmega640/1280/2560) Output Compare Modulator 8/16-channel, 10-bit ADC Two/Four Programmable Serial USART (ATmega1281/2561,ATmega640/1280/2560) Master/Slave SPI Serial Interface Byte Oriented 2-wire Serial Interface Programmable Watchdog Timer with Separate On-chip Oscillator On-chip Analog Comparator Interrupt and Wake-up on Pin Change • Special 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 • I/O and Packages 51/86 Programmable I/O Lines (ATmega1281/2561, ATmega640/1280/2560) 64-lead (ATmega1281/2561) 100-lead (ATmega640/1280/2560) 100-lead TQFP (64-lead TQFP Option) • Temperature Range: -40°C to 85°C Industrial • Speed Grade: ATmega1281/2561V/ATmega640/1280/2560V:0 - 4 MHz @ 1.8 - 5.5V, 0 - 8 MHz @ 2.7 - 5.5V ATmega640/1280/1281/2560/2561:0 - 8 MHz @ 2.7 - 5.5V, 0 - 16 MHz @ 4.5 - 5.5V