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The Arduino Micro is a

microcontroller board based on the

ATmega32u4 (datasheet), developed

in conjunction with Adafruit. It has

20 digital input/output pins (of

which 7 can be used as PWM outputs

and 12 as analog inputs), a 16 MHz

crystal oscillator, a micro USB

connection, an ICSP header, and a

reset button. It contains everything needed to support the microcontroller; simply connect it

to a computer with a micro USB cable to get started. It has a form factor that enables it to be

easily placed on a breadboard.

The Micro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB

communication, eliminating the need for a secondary processor. This allows the Micro to

appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC)

serial / COM port. It also has other implications for the behavior of the board; these are

detailed on the getting started page.

Microcontroller

ATmega32u4

Operating Voltage

Input Voltage (recommended)

7-12V

Input Voltage (limits)

6-20V

Digital I/O Pins

PWM Channels

Analog Input Channels

DC Current per I/O Pin

40 mA

DC Current for 3.3V Pin

50 mA

Flash Memory

32 KB (ATmega32u4) of which 4 KB used by bootloader

SRAM

2.5 KB (ATmega32u4)

EEPROM

1 KB (ATmega32u4)

Clock Speed

16 MHz

The Arduino Micro can be powered via the micro USB connection or with an external power

supply. The power source is selected automatically.

External (non-USB) power can come either from a DC power supply or battery. Leads from a

battery or DC power supply can be connected to the Gnd and Vin pins.

The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V,

however, the 5V pin may supply less than five volts and the board may be unstable. If using

more than 12V, the voltage regulator may overheat and damage the board. The recommended

range is 7 to 12 volts.

The power pins are as follows:

VI. The input voltage to the Arduino board when it's using an external power source (as

opposed to 5 volts from the USB connection or other regulated power source). You can supply

voltage through this pin.

5V. The regulated power supply used to power the microcontroller and other components on

the board. This can come either from VIN via an on-board regulator, or be supplied by USB

or another regulated 5V supply.

Summary of content (4 pages)

PAGE 1
The Arduino Micro is a microcontroller board based on the ATmega32u4 (datasheet), developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started.
PAGE 2
3V. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA. ⏚ Ground pins. The ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library). Each of the 20 digital i/o pins on the Micro can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts.
PAGE 3
Pin Mapping of the Arduino Micro displays the complete functioning for all the pins, to use them as in the Leonardo. See also the mapping between Arduino pins and ATmega32u4 ports. The Micro has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX).
PAGE 4
and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial / COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Micro. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader.