28 Boot Loader Support – Read-While-Write Self-Programming ......... 352
28.1 Boot Loader Features ......................................................................................352
28.2 Application and Boot Loader Flash Sections ...................................................352
28.3 Read-While-Write and No Read-While-Write Flash Sections ..........................352
28.4 Boot Loader Lock Bits ......................................................................................355
28.5 Entering the Boot Loader Program ..................................................................356
28.6 Addressing the Flash During Self-Programming ..............................................360
28.7 Self-Programming the Flash ............................................................................361
29 Memory Programming ......................................................................... 368
29.1 Program And Data Memory Lock Bits ..............................................................368
29.2 Fuse Bits ..........................................................................................................369
29.3 Signature Bytes ................................................................................................371
29.4 Calibration Byte ................................................................................................371
29.5 Parallel Programming Parameters, Pin Mapping, and Commands .................371
29.6 Parallel Programming ......................................................................................374
29.7 Serial Downloading ..........................................................................................382
29.8 Serial Programming Pin Mapping ....................................................................383
29.9 Programming via the JTAG Interface ...............................................................387
30 Electrical Characteristics .................................................................... 400
30.1 Absolute Maximum Ratings* ............................................................................400
30.2 DC Characteristics ...........................................................................................400
30.3 External Clock Drive Waveforms .....................................................................402
30.4 External Clock Drive ........................................................................................402
30.5 Maximum speed vs. VCC ........................................................................................................................402
30.6 2-wire Serial Interface Characteristics .............................................................403
30.7 SPI Timing Characteristics ...............................................................................405
30.8 Hardware Boot EntranceTiming Characteristics ..............................................406
30.9 ADC Characteristics – Preliminary Data ..........................................................407
30.10 External Data Memory Timing .........................................................................408
31 Register Summary ............................................................................... 414
32 Instruction Set Summary .................................................................... 418
33 Ordering Information ........................................................................... 421
34 Packaging Information ........................................................................ 422
34.1 TQFP64 ...........................................................................................................423
7
AT90USB64/128
7593A–AVR–02/06
ATMEL [ ATMEL ]
