DOC7707 datasheet(305/307 Pages) ETC1

305 / 307 page

7707F–AVR–11/10

AT90USB82/162

Boot Loader Support – Read-While-Write Self-Programming ......... 225

23.1 Boot Loader Features ........................................................................................225

23.2 Application and Boot Loader Flash Sections .....................................................225

23.3 Read-While-Write and No Read-While-Write Flash Sections ............................225

23.4 Boot Loader Lock Bits .......................................................................................228

23.5 Entering the Boot Loader Program ....................................................................229

23.6 Addressing the Flash During Self-Programming ...............................................233

23.7 Self-Programming the Flash ..............................................................................233

debugWIRE On-chip Debug System .................................................. 241

24.1 Features ............................................................................................................241

24.2 Overview ...........................................................................................................241

24.3 Physical Interface ..............................................................................................241

24.4 Software Break Points .......................................................................................242

24.5 Limitations of debugWIRE .................................................................................242

24.6 debugWIRE Related Register in I/O Memory ....................................................242

Memory Programming ......................................................................... 243

25.1 Program And Data Memory Lock Bits ...............................................................243

25.2 Fuse Bits ...........................................................................................................244

25.3 Signature Bytes .................................................................................................246

25.4 Calibration Byte .................................................................................................246

25.5 Parallel Programming Parameters, Pin Mapping, and Commands ...................246

25.6 Parallel Programming ........................................................................................249

25.7 Serial Downloading ...........................................................................................257

25.8 Serial Programming Pin Mapping ......................................................................257

Electrical Characteristics .................................................................... 262

26.1 Absolute Maximum Ratings* .............................................................................262

26.2 DC Characteristics ............................................................................................262

26.3 External Clock Drive Waveforms .......................................................................264

26.4 External Clock Drive ..........................................................................................264

26.5 Maximum speed vs. V

CC ........................................................................................................................... 265

26.6 SPI Timing Characteristics ................................................................................265

26.7 Hardware Boot EntranceTiming Characteristics ................................................266

AT90USB82/162 Typical Characteristics – Preliminary Data ........... 268

27.1 Input Voltage Levels ..........................................................................................269

27.2 Output Voltage Levels .......................................................................................271

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