ATMEGA8U2_14 Datasheet, PDF (307/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

7799D–AVR–11/10
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
22 Analog Comparator .............................................................................. 223
22.1Overview ..............................................................................................................223
22.2Register Description ............................................................................................224
23 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
24 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
v