26.2Overview ..............................................................................................................270
26.3Application and Boot Loader Flash Sections .......................................................270
26.4Read-While-Write and No Read-While-Write Flash Sections ..............................271
26.5Boot Loader Lock Bits .........................................................................................273
26.6Entering the Boot Loader Program ......................................................................274
26.7Addressing the Flash During Self-Programming .................................................275
26.8Self-Programming the Flash ................................................................................276
26.9Register Description ............................................................................................284
27 Memory Programming ......................................................................... 286
27.1Program And Data Memory Lock Bits .................................................................286
27.2Fuse Bits ..............................................................................................................287
27.3Signature Bytes ...................................................................................................289
27.4Calibration Byte ...................................................................................................289
27.5Page Size ............................................................................................................290
27.6Parallel Programming Parameters, Pin Mapping, and Commands .....................290
27.7Parallel Programming ..........................................................................................292
27.8Serial Downloading ..............................................................................................299
28 Electrical Characteristics .................................................................... 304
28.1Absolute Maximum Ratings* ...............................................................................304
28.2DC Characteristics ...............................................................................................304
28.3Speed Grades .....................................................................................................306
28.4Clock Characteristics ...........................................................................................307
28.5System and Reset Characteristics ......................................................................308
28.62-wire Serial Interface Characteristics .................................................................309
28.7SPI Timing Characteristics ..................................................................................310
28.8ADC Characteristics ............................................................................................312
28.9Parallel Programming Characteristics .................................................................313
29 Typical Characteristics ........................................................................ 316
29.1Active Supply Current ..........................................................................................316
29.2Idle Supply Current ..............................................................................................319
29.3Supply Current of I/O modules ............................................................................322
29.4Power-Down Supply Current ...............................................................................324
29.5Power-Save Supply Current ................................................................................325
29.6Standby Supply Current ......................................................................................325
29.7Pin Pull-up ...........................................................................................................326
vi
ATmega48/88/168
2545M–AVR–09/07
ATMEL [ ATMEL ]
