A000053 Datasheet A000053 | P4-P6

Inaddition,somepinshavespecializedfunctions:

 Serial:0(RX)and1(TX).Usedtoreceive(RX)andtransmit(TX)TTLserialdata

usingtheATmega32U4hardwareserialcapability.NotethatontheMicro,the

SerialclassreferstoUSB(CDC)communication;forTTLserialonpins0and1,use

theSerial1class.



 TWI:2(SDA)and3(SCL).SupportTWIcommunicationusingtheWirelibrary.

https://www.arduino.cc/en/Reference/Wire



 ExternalInterrupts:0(RX),1(TX),2,3and7.Thesepinscanbeconfiguredto

triggeraninterruptonalowvalue,arisingorfallingedge,orachangeinvalue.

SeetheattachInterrupt()functionfordetails.

https://www.arduino.cc/en/Reference/AttachInterrupt



 PWM:3,5,6,9,10,11and13.Provide8‐bitPWMoutput with

theanalogWrite()function.

https://www.arduino.cc/en/Reference/AttachInterrupt



 SPI:ontheICSPheader.ThesepinssupportSPIcommunicationusingtheSPI

library.NotethattheSPIpinsarenotconnectedtoanyofthedigitalI/Opinsas

theyareontheUno,theyareonlyavailableontheICSPconnectorand onthe

nearbypinslabelledMISO,MOSIandSCK.

https://www.arduino.cc/en/Reference/SPI



 RX_LED/SSThisisanadditionalpincomparedtotheLeonardo.Itisconnectedto

theRX_LEDthatindicatestheactivityoftransmissionduringUSBcommunication,

butiscanalsousedasslaveselectpin(SS)inSPIcommunication.



 LED:13.Thereisabuilt‐inLEDconnectedtodigitalpin13.WhenthepinisHIGH

value,theLEDison,whenthepinisLOW,it'soff.



 AnalogInputs:A0‐A5,A6‐A11(ondigitalpins4,6,8,9,10,and12).TheMicrohas

atotalof12analoginputs,pinsfromA0toA5arelabelleddirectlyonthepinsand

theotheronesthatyoucanaccessincodeusingtheconstantsfromA6troughA11

aresharedrespectivelyondigitalpins4,6,8,9,10,and12.Allofwhichcanalso

beusedasdigitalI/O.Eachanaloginputprovide10bitsofresolution(i.e.1024

differentvalues).Bydefaulttheanaloginputsmeasurefromgroundto5volts,

thoughisitpossibletochangetheupperendoftheirrangeusingtheAREFpinand

theanalogReference()function.

https://www.arduino.cc/en/Reference/AnalogReference



Thereareacoupleofotherpinsontheboard:



 AREF.Referencevoltagefortheanaloginputs.UsedwithanalogReference().

 Reset.BringthislineLOWtoresetthemicrocontroller.Typicallyusedtoadda

resetbuttontoshieldswhichblocktheoneontheboard.

Communication

TheMicrohasanumberoffacilitiesforcommunicatingwithacomputer,another

boardoftheArduino&Genuinofamily,orothermicrocontrollers.The32U4

providesUARTTTL(5V)serialcommunication,whichisavailableondigitalpins0

(RX)and1(TX).TheATmega32U4alsoallowsforserial(CDC)communication over

USBandappearsasavirtualcomporttosoftwareonthecomputer.Thechipalso

actsasafullspeedUSB2.0device,usingstandardUSBCOMdrivers.OnWindows,

a.inffileis required.TheArduinoSoftware(IDE)includesaserialmonitorwhich

allowssimpletextualdatatobesenttoandfromtheboard.TheRXandTXLEDson

theboardwillflashwhendataisbeingtransmittedviatheUSBconnectiontothe

computer(butnotforserialcommunicationonpins0 and1).



ASoftwareSeriallibraryallowsforserialcommunication onotherMicro'sdigital

pins.

https://www.arduino.cc/en/Reference/SoftwareSerial



TheATmega32U4alsosupportsI2C(TWI)andSPIcommunication.TheArduino

Software(IDE)includesaWirelibrarytosimplifyuseoftheI2Cbus;see

thedocumentationfordetails.ForSPIcommunication,usetheSPIlibrary.

https://www.arduino.cc/en/Reference/Wire

https://www.arduino.cc/en/Reference/SPI



TheMicroappearsasagenerickeyboardandmouse,andcanbeprogrammedto

controltheseinputdevicesusingtheKeyboardandMouseclasses.

PhysicalCharacteristics

ThemaximumlengthandwidthoftheMicroPCBare4.8cmand1.77cm

respectively,withtheUSBconnectorextendingbeyondtheformerdimension.The

layoutallowsforeasyplacementonasolderlessbreadboard..

Automatic(Software)ResetandBootloaderInitiation

Ratherthanrequiringaphysicalpressoftheresetbuttonbeforeanupload,the

Microboardisdesignedinawaythatallowsittoberesetbysoftwarerunningon

aconnectedcomputer.TheresetistriggeredwhentheMicro'svirtual(CDC)serial

/COMportisopenedat1200baud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.



BecauseofthewaytheMicrohandlesresetit'sbesttolettheArduinoSoftware

(IDE)trytoinitiatetheresetbeforeuploading,especiallyifyouareinthehabitof

pressingtheresetbuttonbeforeuploadingonotherboards. Ifthesoftwarecan't

resetthe board,youcanalwaysstartthebootloaderbypressingtheresetbutton

ontheboard.



https://store.arduino.cc/usa/arduino‐micro12‐6‐17

P1-P3 P4-P6

A000053

Mfr. #:

Buy A000053

Manufacturer:

Arduino

Description:

Development Boards & Kits - AVR Arduino Micro

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

A000053