Data Sheet

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