8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash ATMEGA1281-16AU

8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash

ATmega640/V

ATmega1280/V

ATmega1281/V

ATmega2560/V

ATmega2561/V

Features

• 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

• High Endurance Non-volatile Memory Segments

  – 64K/128K/256K Bytes of In-System Self-Programmable Flash

  – 4K Bytes EEPROM

  – 8K Bytes Internal SRAM

  – Write/Erase Cycles:10,000 Flash/100,000 EEPROM

  – Data retention: 20 years at 85°C/ 100 years at 25°C

  – Optional Boot Code Section with Independent Lock Bits

• In-System Programming by On-chip Boot Program

• True Read-While-Write Operation

  – Programming Lock for Software Security Endurance: Up to 64K Bytes Optional External Memory Space

• 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 (ATmega1281/2561, ATmega640/1280/2560)

  – 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

  – 54/86 Programmable I/O Lines (ATmega1281/2561, ATmega640/1280/2560)

  – 64-pad QFN/MLF, 64-lead TQFP (ATmega1281/2561)

  – 100-lead TQFP, 100-ball CBGA (ATmega640/1280/2560)

  – RoHS/Fully Green

• Temperature Range:

  – -40°C to 85°C Industrial

• Ultra-Low Power Consumption

  – Active Mode: 1 MHz, 1.8V: 500 µA

  – Power-down Mode: 0.1 µA at 1.8V

• Speed Grade:

  – ATmega640V/ATmega1280V/ATmega1281V:

     0 - 4 MHz @ 1.8 - 5.5V, 0 - 8 MHz @ 2.7 - 5.5V

  – ATmega2560V/ATmega2561V:

     0 - 2 MHz @ 1.8 - 5.5V, 0 - 8 MHz @ 2.7 - 5.5V

  – ATmega640/ATmega1280/ATmega1281:

     0 - 8 MHz @ 2.7 - 5.5V, 0 - 16 MHz @ 4.5 - 5.5V

  – ATmega2560/ATmega2561:

     0 - 16 MHz @ 4.5 - 5.5V

1. Pin Configurations Figure

1-1. TQFP-pinout ATmega640/1280/2560

Figure 1-2. CBGA-pinout ATmega640/1280/2560

Figure 1-3. Pinout ATmega1281/2561

Note: The large center pad underneath the QFN/MLF package is made of metal and internally connected to GND. It should be soldered or glued to the board to ensure good mechanical stability. If the center pad is left unconnected, the package might loosen from the board.

2. Overview

The ATmega640/1280/1281/2560/2561 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock 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.

2.1 Block Diagram

Figure 2-1. Block Diagram