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ATMega2560 Microcontroller

The ATMega2560 from Atmel is an 8-bit low-power microcontroller that is found in the popular Arduino Mega development board. It is based on the 8-bit AVR RISC architecture and has 256KB flash memory, 8KB SRAM, and 4KB EEPROM. It also has a wide variety of peripherals, including timers, counters, PWM generators, a comparator, and ADCs. It can be clocked up to 16MHz with a 5V supply.


ATMega2560 Pinout Configuration

Pin Number

Pin Name


10, 31, 61, 80


IC Supply pins

11, 32, 62, 81, 99


IC ground reference pins



Reference supply for ADC



Supply pin for analog peripherals

33, 34


Crystal oscillator pins


ATmega2560 RESET Pin

Reset pin, active low

2 - 9

PE0 – PE7

GPIO Port E pins

12 – 18, 27

PH0 – PH6, PH7

GPIO Port H pins

19 - 26

PB0 – PB7

GPIO Port B pins

28 – 29, 51 – 52, 70

PG3 – PG4, PG0 – PG1, PG2

GPIO Port G pins

35 - 42

PL0 – PL7

GPIO Port L pins

43 - 50

PD0 – PD7

GPIO Port D pins

53 - 60

PC0 – PC7

GPIO Port C pins

63 – 69, 79

PJ0 – PJ6, PJ7

GPIO Port J pins

71 - 78

PA7 – PA0

GPIO Port A pins

82 - 89

PK7 – PK0

GPIO Port K pins

90 - 97

PF7 – PF0

GPIO Port F pins


Features and Specifications

  • 86 programmable IO lines
  • Two 8-bit timer/counters, four 16-bit timer/counters
  • 16-channel 10-bit ADC
  • Four USART
  • SPI serial interface
  • On-chip analog comparator


Note: Complete technical details can be found in the ATMega2560 datasheet given at the end of this page.


ATMega2560 Equivalents

ATMega640, ATMega1280


Other Microcontrollers



How To Use ATMega2560?

The ATMega2560 is an 8-bit AVR microcontroller that comes with 86 programmable GPIO pins, PWM, ADC, and timer peripherals. It can be programmed using Atmel Studio and a dedicated programmer, or using another ATMega microcontroller and using the Arduino development environment. The easiest to use is the Arduino Mega board, which contains the ATMega3560, and can be programmed over USB from the Arduino software. The GPIO pins are also mapped internally to the peripherals like SPI, USART, and SPI. The ATMega2560 uses 5V logic levels, so it might not be compatible with 3.3V sensors and other peripherals. This is not a major limitation, it can be overcome using level shifting circuits. Thanks to its large number of GPIO pins, the ATMega2560 overcomes the limitations of smaller microcontrollers like the ATMega328P and allows it to communicate with more sensors and peripherals, while also leaving a large number of GPIO pins available for other tasks.



  • Embedded electronics control
  • Robotics, HID
  • Mixed-signal electronics


2D Model and Dimensions

If you are designing a PCB or Perf board with this component then the following picture from the Datasheet will be useful to know its package type and dimensions.

ATMega2560 Microcontroller Dimensions

Component Datasheet

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