ATmega644PA datasheet(466/468 Pages) ATMEL

466 / 468 page

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

24.3Data Registers .....................................................................................................269

24.4Boundary-scan Specific JTAG Instructions .........................................................270

24.5Boundary-scan Chain ..........................................................................................271

24.6ATmega164PA/324PA/644PA/1284P Boundary-scan Order ..............................274

24.7Boundary-scan Description Language Files ........................................................276

24.8Register Description ............................................................................................277

Boot Loader Support – Read-While-Write Self-Programming ......... 278

25.1Features ..............................................................................................................278

25.2Overview .............................................................................................................278

25.3Application and Boot Loader Flash Sections .......................................................278

25.4Read-While-Write and No Read-While-Write Flash Sections ..............................279

25.5Boot Loader Lock Bits .........................................................................................281

25.6Entering the Boot Loader Program ......................................................................282

25.7Addressing the Flash During Self-Programming .................................................283

25.8Self-Programming the Flash ................................................................................284

25.9Register Description ............................................................................................294

Memory Programming ......................................................................... 296

26.1Program And Data Memory Lock Bits .................................................................296

26.2Fuse Bits .............................................................................................................297

26.3Signature Bytes ...................................................................................................299

26.4Calibration Byte ...................................................................................................299

26.5Page Size ............................................................................................................299

26.6Parallel Programming Parameters, Pin Mapping, and Commands .....................300

26.7Parallel Programming ..........................................................................................302

26.8Serial Downloading .............................................................................................311

26.9Serial Programming Instruction set .....................................................................313

26.10Programming via the JTAG Interface ................................................................315

Electrical Characteristics .................................................................... 328

27.1DC Characteristics ..............................................................................................328

27.2Speed Grades .....................................................................................................332

27.3Clock Characteristics ...........................................................................................333

27.4System and Reset Characteristics ......................................................................334

27.5External Interrupts Characteristics ......................................................................334

27.6SPI Timing Characteristics ..................................................................................335

27.72-wire Serial Interface Characteristics .................................................................336

ATmega644PA Datasheet(PDF) 466 Page - ATMEL Corporation