Datasheet

vi
8025M–AVR–6/11
ATmega48P/88P/168P
26 Self-Programming the Flash, ATmega48P ........................................ 267
26.1Overview .............................................................................................................267
26.2Addressing the Flash During Self-Programming .................................................268
26.3Register Description’ ...........................................................................................273
27 Boot Loader Support – Read-While-Write Self-Programming,
ATmega88P and ATmega168P 275
27.1Features ..............................................................................................................275
27.2Overview .............................................................................................................275
27.3Application and Boot Loader Flash Sections .......................................................275
27.4Read-While-Write and No Read-While-Write Flash Sections ..............................276
27.5Boot Loader Lock Bits .........................................................................................278
27.6Entering the Boot Loader Program ......................................................................279
27.7Addressing the Flash During Self-Programming .................................................280
27.8Self-Programming the Flash ................................................................................280
27.9Register Description ............................................................................................289
28 Memory Programming ......................................................................... 291
28.1Program And Data Memory Lock Bits .................................................................291
28.2Fuse Bits .............................................................................................................292
28.3Signature Bytes ...................................................................................................294
28.4Calibration Byte ...................................................................................................294
28.5Page Size ............................................................................................................295
28.6Parallel Programming Parameters, Pin Mapping, and Commands .....................295
28.7Parallel Programming ..........................................................................................297
28.8Serial Downloading .............................................................................................304
29 Electrical Characteristics .................................................................... 309
29.1Absolute Maximum Ratings* ...............................................................................309
29.2DC Characteristics ..............................................................................................309
29.3Speed Grades .....................................................................................................312
29.4Clock Characteristics ...........................................................................................313
29.5System and Reset Characteristics ......................................................................314
29.6SPI Timing Characteristics ..................................................................................315
29.72-wire Serial Interface Characteristics .................................................................317
29.8ADC Characteristics – Preliminary Data ..............................................................319
29.9Parallel Programming Characteristics .................................................................320
30 Typical Characteristics ........................................................................ 322