ATmega32U2 datasheet(311/314 Pages) ATMEL

311 / 314 page

7799B–AVR–07/09

ATmega8U2/16U2/32U2

21.4USB reset ............................................................................................................198

21.5Endpoint selection ...............................................................................................198

21.6Endpoint activation ..............................................................................................198

21.7Address Setup .....................................................................................................199

21.8Suspend, Wake-up and Resume .........................................................................200

21.9Detach .................................................................................................................200

21.10Remote Wake-up ...............................................................................................201

21.11STALL request ...................................................................................................201

21.12CONTROL endpoint management ....................................................................202

21.13OUT endpoint management ..............................................................................203

21.14IN endpoint management ..................................................................................205

21.15Isochronous mode .............................................................................................207

21.16Overflow ............................................................................................................207

21.17Interrupts ...........................................................................................................208

21.18Register Description ..........................................................................................209

Analog Comparator .............................................................................. 223

22.1Overview ..............................................................................................................223

22.2Register Description ............................................................................................224

Boot Loader Support – Read-While-Write Self-Programming ......... 226

23.1Features ..............................................................................................................226

23.2Overivew ..............................................................................................................226

23.3Application and Boot Loader Flash Sections .......................................................226

23.4Read-While-Write and No Read-While-Write Flash Sections ..............................227

23.5Boot Loader Lock Bits .........................................................................................229

23.6Entering the Boot Loader Program ......................................................................230

23.7Addressing the Flash During Self-Programming .................................................232

23.8Self-Programming the Flash ................................................................................233

23.9Register Description ............................................................................................242

debugWIRE On-chip Debug System .................................................. 244

24.1Features ..............................................................................................................244

24.2Overview ..............................................................................................................244

24.3Physical Interface ................................................................................................244

24.4Software Break Points .........................................................................................245

24.5Limitations of debugWIRE ...................................................................................245

24.6Register Description ............................................................................................245

ATmega32U2 Datasheet(PDF) 311 Page - ATMEL Corporation