ATmega2560 Pinout, Specifications & Datasheet

Last updated on March 16th, 2024 at 01:32 pm

The ATmega2560 was specially designed for complex circuitry and more storage, most of the electronics projects can be performed on other microcontrollers which makes this uncommon, but few projects can be solely done by ATmega2560 as other microcontrollers lack in terms of pins, storage, and performance.

The ATmega2560 is majorly seen in the Arduino Mega development board. This board is really useful in robotics projects that require a large number of GPIO pins.

ATmega 2560 on Arduino Mega board
ATmega 2560 on Arduino Mega board
ATmega 2560 SMD package
ATmega 2560 SMD package

The ATmega2560 is a low-power 8-bit microcontroller that is based on AVR-RISC architecture. It can execute powerful instructions and its clock frequency is 16MHz. This microcontroller has 8KB SRAM, 4 KB EEPROM, and 256KB of programable flash memory with read-write capabilities. 8 KB out of 256 KB flash memory is used by the bootloader.

Specifications of ATmega2560

The ATmega 2560 operates in a voltage range of 7-12V. This microcontroller has 8KB SRAM, 4 KB EEPROM, and 256KB of programable flash memory. Other specifications are listed in the table below.

Program memory256KB (flash)
Communication peripherals4-UART, 5-SPI, 1-I2C
Temperature range-40 to 85 C
Operating Voltage Range7-12 volts (recommended)
Pin Count100
Digital Pins54
Analog Pins16
PWM peripherals15 Pins
Timer2 x 8-bit, 4 x 16-bit
ATmega 2560 specifications


ATmega 2560 Architecture
ATmega 2560 Architecture

The AVR core of ATmega2560 combines a rich set of instructions with 32 general-purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU). The resulting architecture is more code efficient and ten times faster than conventional CISC microcontrollers.


To maximize performance, the Atmega2560 uses an AVR-RISC (Harvard architecture) – with separate memories and buses for program and data. While one instruction is being executed, the next instruction is pre-fetched from the program memory. This concept enables instructions to be executed in every clock cycle. The program memory is In-System Reprogrammable Flash memory


The ALU supports arithmetic and logic operations between registers or between a constant and a register. Single register operations can also be executed in the ALU.


ATmega2560 has two main memory spaces: the Data Memory and the Program Memory. In addition, ATmega2560 contains 256KB In-System Reprogrammable Flash memory for program storage.

For software security, the Flash Program memory space is divided into two sections, the Boot Program section and the Application Program section.


The ATmega2560 has multiple clocks, i.e., CPU clock, I/O clock, Flash clock, ADC clock, and Asynchronous clock. All the clocks of Atmega2560 need not be active at a given time. In order to reduce power consumption, the clocks modules not being used can be halted by using different sleep modes.


The ATmega2560 has 32 × 8-bit general-purpose working registers with a single clock cycle access time. Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data Space addressing, enabling efficient address calculations.

Communication Peripherals

The ATmega2560 offers 4 ports of UART communication (TX-RX), 5 SPI peripherals, and one I2C peripheral.

Operating parameters

The input voltage range of the ATmega2560 is 2.7V – 5.5V. The output current from the input-output pins is near around 40mA.

Read also: ATmega328p Pinout, datasheet, and specifications

ATmega2560 Pinout

ATmega 2560 pinout
ATmega 2560 pinout

There are a total of 100 pins on ATmega2560, of which 16 are analog input pins and 54 digital input/output pins. Out of 54 digital pins, 15 can be used as PWM pins. It also has 4 UART ports (8 pins), 5 SPI peripherals, and 1 I2C port. The complete pinout is given in the table below.

Pin NumberNameDescription
10, 31, 61, 80VCCSupply Pins
11, 32, 62, 81, 99GNDGround pins
98AREFFReference supply for ADC
100AVCCSupply pin for analog peripherals
33, 34XATLCrystal oscillators pins
30RESETReset pin
2, 3PE0, PE1Digital pin (TX0, RX0)
46-47PD2,PD3Digital Pins (TX1, RX1)
12,13PH0,PH1Digital Pin (TX2, RX2)
63, 64PJ0, PJ1Digital Pins (TX3, RX3)
5-7PE3-PE5Digital Pin (PWM)
15-18, 24-26PH0-PH6, PB4-PB7Digital Pin (PWM)
38-40PL3-PL5Digital Pin (PWM)
19, 20PB0, PB1Digital Pin (SS, SCK)
35-37PL0-PL2Digital Pin
47-60PC0-PC7Digital Pin
70-78PA7-PA0Digital Pins
4,8,9,14PE2,PE6,PE7,PH2Digital Pin
28-29, 51-52, 70, 1PG3-PG4, PG0-PG1, PG2, PG5Digital Pins
82-97PF7-PF0, PK7-PK0Analog Pins
ATmega2560 pinout


Given below is the datasheet of ATmega2560 by Atmel. You can download it from here.

ATmega2560 datasheet
ATmega2560 datasheet

Why ATmega2560 is better?

ATmega2560 is preferably used when we need more GPIO pins, flash memory, or faster executions. ATmega2560 provides comparatively more IO pins than other microcontrollers of this series available in the market. ATmega2560 offers 8KB of SRAM and 256KB of flash memory which is more as compared to other microcontrollers.

Which boards use ATmega2560?

ATmega2560 microcontroller is present in many development boards, among which the most common is Arduino mega. Some of the boards that use ATmega2560 microcontroller are:

  • Arduino Mega2560
  • Seeeduino Mega
  • Mega Wi-Fi R3 Atmega2560
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Vikas Gariyal

Electrical engineer by profession, I employ graphic design as a visual art to simplify and enhance electronic content for clarity and engagement, making complex ideas easily understandable. My work combines creativity and technology to create captivating and effective visual storytelling.

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