337
7530J–AVR–03/12
Atmel ATmega48/88/168 Automotive
22.5
Limitations of debugWIRE .............................................................................255
22.6
debugWIRE Related Register in I/O Memory ................................................255
23
Self-Programming the Flash, ATmega48 ........................................... 256
23.1
Addressing the Flash During Self-Programming ...........................................257
24
Boot Loader Support – Read-While-Write Self-Programming,
ATmega88 and ATmega168 ................................................................ 263
24.1
Boot Loader Features ....................................................................................263
24.2
Application and Boot Loader Flash Sections .................................................263
24.3
Read-While-Write and No Read-While-Write Flash Sections ........................264
24.4
Boot Loader Lock Bits ...................................................................................266
24.5
Entering the Boot Loader Program ................................................................267
24.6
Addressing the Flash During Self-Programming ...........................................269
24.7
Self-Programming the Flash ..........................................................................270
25
Memory Programming ......................................................................... 278
25.1
Program And Data Memory Lock Bits ...........................................................278
25.2
Fuse Bits ........................................................................................................280
25.3
Signature Bytes .............................................................................................282
25.4
Calibration Byte .............................................................................................282
25.5
Parallel Programming Parameters, Pin Mapping, and Commands ...............282
25.6
Serial Programming Pin Mapping ..................................................................285
25.7
Parallel Programming ....................................................................................285
25.8
Serial Downloading ........................................................................................293
26
Electrical Characteristics .................................................................... 298
26.1
Absolute Maximum Ratings* .........................................................................298
26.2
DC Characteristics .........................................................................................298
26.3
External Clock Drive Waveforms ...................................................................300
26.4
External Clock Drive ......................................................................................300
26.5
Maximum Speed vs. V
CC ............................................................................... 301
26.6
LIN Re-synchronization algorithm .................................................................301
26.7
Synchronization Algorithm .............................................................................301
26.8
Precaution Against OSCCAL Discontinuity ...................................................302
27
2-wire Serial Interface Characteristics ............................................... 303
27.1
SPI Timing Characteristics ............................................................................305
27.2
ADC Characteristics .....................................................................................306