Datasheet

v
2545F–AVR–06/05
23.5 Limitations of debugWIRE ..................................................................................256
23.6 debugWIRE Related Register in I/O Memory .....................................................256
24 Self-Programming the Flash, ATmega48 ........................................... 256
24.1 Addressing the Flash During Self-Programming ................................................258
25 Boot Loader Support – Read-While-Write Self-Programming,
ATmega88 and ATmega168 264
25.1 Boot Loader Features .........................................................................................264
25.2 Application and Boot Loader Flash Sections ......................................................264
25.3 Read-While-Write and No Read-While-Write Flash Sections .............................265
25.4 Boot Loader Lock Bits ........................................................................................267
25.5 Entering the Boot Loader Program .....................................................................268
25.6 Addressing the Flash During Self-Programming ................................................270
25.7 Self-Programming the Flash ...............................................................................271
26 Memory Programming ......................................................................... 280
26.1 Program And Data Memory Lock Bits ................................................................280
26.2 Fuse Bits ............................................................................................................281
26.3 Signature Bytes ..................................................................................................283
26.4 Calibration Byte ..................................................................................................284
26.5 Page Size ...........................................................................................................284
26.6 Parallel Programming Parameters, Pin Mapping, and Commands ....................284
26.7 Parallel Programming .........................................................................................286
26.8 Serial Downloading ............................................................................................295
27 Electrical Characteristics .................................................................... 300
27.1 Absolute Maximum Ratings* ..............................................................................300
27.2 DC Characteristics ATmega48/88/168* ..............................................................300
27.3 External Clock Drive Waveforms ........................................................................302
27.4 External Clock Drive ...........................................................................................302
27.5 Maximum Speed vs. V
CC ........................................................................................................................... 302
27.6 2-wire Serial Interface Characteristics ................................................................303
27.7 SPI Timing Characteristics .................................................................................305
27.8 ADC Characteristics – Preliminary Data .............................................................307
28 ATmega48/88/168 Typical Characteristics – Preliminary Data ........ 308
28.1 Active Supply Current .........................................................................................308
28.2 Idle Supply Current .............................................................................................311
28.3 Supply Current of I/O modules ...........................................................................314