User Manual

vi
ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
8271E–AVR–07/2012
26.2Addressing the Flash During Self-Programming .................................................262
26.3Register Description ............................................................................................267
27 Boot Loader Support – Read-While-Write Self-Programming ......... 269
27.1Features ..............................................................................................................269
27.2Overview ..............................................................................................................269
27.3Application and Boot Loader Flash Sections .......................................................269
27.4Read-While-Write and No Read-While-Write Flash Sections ..............................269
27.5Boot Loader Lock Bits .........................................................................................272
27.6Entering the Boot Loader Program ......................................................................273
27.7Addressing the Flash During Self-Programming .................................................274
27.8Self-Programming the Flash ................................................................................275
27.9Register Description ............................................................................................283
28 Memory Programming ......................................................................... 285
28.1Program And Data Memory Lock Bits .................................................................285
28.2Fuse Bits ..............................................................................................................286
28.3Signature Bytes ...................................................................................................289
28.4Calibration Byte ...................................................................................................289
28.5Page Size ............................................................................................................290
28.6Parallel Programming Parameters, Pin Mapping, and Commands .....................290
28.7Parallel Programming ..........................................................................................292
28.8Serial Downloading ..............................................................................................299
29 Electrical Characteristics .................................................................... 303
29.1Absolute Maximum Ratings* ...............................................................................303
29.2DC Characteristics ...............................................................................................303
29.3Speed Grades .....................................................................................................308
29.4Clock Characteristics ...........................................................................................309
29.5System and Reset Characteristics ......................................................................310
29.6SPI Timing Characteristics ..................................................................................311
29.7Two-wire Serial Interface Characteristics ............................................................313
29.8ADC Characteristics ............................................................................................315
29.9Parallel Programming Characteristics .................................................................316
30 Typical Characteristics ........................................................................ 318
30.1ATmega48A Typical Characteristics ...................................................................319
30.2ATmega48PA Typical Characteristics .................................................................344
30.3ATmega88A Typical Characteristics ...................................................................368