Datasheet

vi
8272A–AVR–01/10
164A/164PA/324A/324PA/644A/644PA/1284/1284P
24.2Overview .............................................................................................................267
24.3Data Registers .....................................................................................................268
24.4Boundary-scan Specific JTAG Instructions .........................................................269
24.5Boundary-scan Chain ..........................................................................................270
24.6ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P Boundary-scan Order
273
24.7Boundary-scan Description Language Files ........................................................275
24.8Register Description ............................................................................................276
25 Boot Loader Support – Read-While-Write Self-Programming ......... 277
25.1Features ..............................................................................................................277
25.2Overview .............................................................................................................277
25.3Application and Boot Loader Flash Sections .......................................................277
25.4Read-While-Write and No Read-While-Write Flash Sections ..............................278
25.5Boot Loader Lock Bits .........................................................................................280
25.6Entering the Boot Loader Program ......................................................................281
25.7Addressing the Flash During Self-Programming .................................................282
25.8Self-Programming the Flash ................................................................................283
25.9Register Description ............................................................................................293
26 Memory Programming ......................................................................... 295
26.1Program And Data Memory Lock Bits .................................................................295
26.2Fuse Bits .............................................................................................................296
26.3Signature Bytes ...................................................................................................298
26.4Calibration Byte ...................................................................................................298
26.5Page Size ............................................................................................................298
26.6Parallel Programming Parameters, Pin Mapping, and Commands .....................299
26.7Parallel Programming ..........................................................................................301
26.8Serial Downloading .............................................................................................310
26.9Serial Programming Instruction set .....................................................................312
26.10Programming via the JTAG Interface ................................................................314
27 Electrical Characteristics .................................................................... 327
27.1DC Characteristics ..............................................................................................327
27.2Speed Grades .....................................................................................................333
27.3Clock Characteristics ...........................................................................................334
27.4System and Reset Characteristics ......................................................................335
27.5External Interrupts Characteristics ......................................................................335