ATmega series are AVR 8-bit microcontrollers produced by Atmel, providing 135 powerful instructions that can be executed in a single cycle, with 32 8-bit general purpose working registers, fully static operation, and a maximum clock frequency of 16 MHz. Integrated 2 cycle multiplier
The ATmega640/1280/1281/2560/2561 family are low‑power CMOS 8‑bit microcontrollers based on the AVR enhanced RISC architecture. They offer up to 16 MIPS at 16 MHz, on‑chip 2‑cycle multiplier, and a rich set of peripherals including multiple timers, ADCs, USARTs, SPI, and JTAG debug.
The document details package options (TQFP, QFN/MLF, CBGA), pin‑out diagrams, I/O port descriptions, electrical characteristics, and revision history. It also includes a comparison table of memory sizes and I/O counts for each device variant.
| Flash Memory | 64 KB – 256 KB |
|---|---|
| EEPROM | 4 KB |
| SRAM | 8 KB |
| Programmable I/O Lines | 54 or 86 |
| ADC Resolution | 10‑bit, up to 16 channels |
| Power‑down Current | 0.1 pA @ 1.8 V |
| Programming Interface | JTAG |
| Timers | Four 16‑bit Timer/Counters |
The ATmega640 offers 86 programmable I/O lines.
In Power‑down mode the device draws only 0.1 pA at 1.8 V.
Programming is performed through the JTAG interface.