ATMEL ATmega2561 8‑Bit Microcontroller 256KB Flash SMD TQFP‑64

The ATMEL ATmega2561‑16AU is a high‑performance, low‑power 8‑bit AVR® RISC‑based microcontroller. It combines 256KB of in‑system programmable (ISP) flash memory, 8KB of SRAM, and 4KB of EEPROM, offering a robust memory configuration for complex embedded applications. The device features 86 general‑purpose I/O lines, 32 general‑purpose working registers, a real‑time counter, six flexible timers/counters with compare modes, PWM, four USARTs, a byte‑oriented 2‑wire serial interface, an 8‑channel 10‑bit A/D converter, and a JTAG interface for on‑chip debugging.

Manufactured using Atmel's high‑density non‑volatile memory technology, the microcontroller achieves a throughput of 16 MIPS at 16MHz and operates from 4.5V to 5.5V. By executing powerful instructions in a single clock cycle, it delivers a throughput approaching 1 MIPS per MHz, providing an optimal balance between power consumption and processing speed. The on‑chip ISP flash allows the program memory to be reprogrammed in‑system via an SPI serial interface, a conventional memory programmer, or an on‑chip boot program running on the AVR core.

Key Features & Architecture

• Advanced RISC architecture with 135 powerful instructions, most executing in a single clock cycle.
• 32 x 8 general‑purpose working registers and fully static operation.
• On‑chip 2‑cycle multiplier for efficient mathematical operations.
• Programmable watchdog timer with a separate on‑chip oscillator.
• On‑chip analog comparator.
• Interrupt and wake‑up on pin change functionality.
• Comprehensive communication interfaces: Master/Slave SPI, byte‑oriented 2‑wire (I2C), and JTAG (IEEE 1149.1 compliant).
• Output compare modulator.
• QTouch® library support for capacitive touch sensing.
• Six sleep modes (idle, ADC noise reduction, power‑save, power‑down, standby, extended standby) for advanced power management.
• Power‑on reset and a <a