The document describes a high-performance, low-power AVR® 8-bit microcontroller with advanced RISC architecture. It includes 130 powerful instructions, most of which can be executed in a single clock cycle. The microcontroller features 32 x 8 general purpose working registers, fully static operation, up to 16 MIPS throughput at 16 MHz, and an on-chip 2-cycle multiplier. It also has high endurance non-volatile memory segments, including in-system self-programmable flash program memory, EEPROM, and internal SRAM. The microcontroller supports in-system programming by an on-chip boot program, true read-while-write operation, and programming lock for software security. It also has a JTAG interface for boundary-scan capabilities and extensive on-chip debug support. The peripheral features of the microcontroller include LCD drivers, timer/counters, a real-time counter, PWM channels, and an ADC.
The ATmega329/ATmega3290/ATmega649/ATmega6490 family are low‑power 8‑bit AVR microcontrollers with up to 64 KB of flash, on‑chip EEPROM, SRAM, multiple I/O ports and a range of peripherals such as ADC, USART, SPI and LCD driver. They support in‑system programming, JTAG debugging and a variety of power‑saving modes.
The document provides detailed specifications, pin‑out diagrams, electrical characteristics, package options, and revision history for each device variant, helping designers select the appropriate memory size, I/O count and operating speed for their embedded applications.
| Flash Memory (ATmega329/ATmega3290) | 32 KB |
|---|---|
| Flash Memory (ATmega649/ATmega6490) | 64 KB |
| EEPROM (ATmega329/ATmega3290) | 1 KB |
| EEPROM (ATmega649/ATmega6490) | 2 KB |
| SRAM (ATmega329/ATmega3290) | 2 KB |
| SRAM (ATmega649/ATmega6490) | 4 KB |
| Programmable I/O Lines | 54 (ATmega329/ATmega649) or 69 (ATmega3290/ATmega6490) |
| Package Types | 64‑lead TQFP, 64‑pad QFN/MLF, 100‑lead TQFP |
| Power‑down Current (1.8 V) | 100 nA |
The ATmega649 provides 64 KB of flash memory.
In power‑down mode the device draws about 100 nA at 1.8 V.
They are available in 64‑lead TQFP, 64‑pad QFN/MLF, and 100‑lead TQFP packages.