Datasheet

vii
7593L–AVR–09/12
AT90USB64X/128X
28.4 Boundary-scan specific JTAG instructions ........................................................335
28.5 Boundary-scan Related Register in I/O memory ...............................................336
28.6 Boundary-scan chain .........................................................................................337
28.7 Atmel AT90USB64/128 Boundary-scan order ...................................................340
28.8 Boundary-scan description language files .........................................................342
29 Boot Loader support – read-while-write self-programming ............. 343
29.1 Boot Loader features .........................................................................................343
29.2 Application and Boot Loader flash sections ......................................................343
29.3 Read-while-write and no read-while-write flash sections ...................................343
29.4 Boot Loader lock bits .........................................................................................346
29.5 Entering the Boot Loader program ....................................................................347
29.6 Addressing the flash during self-programming ..................................................350
29.7 Self-programming the flash ...............................................................................351
30 Memory programming ......................................................................... 359
30.1 Program and data memory lock bits ..................................................................359
30.2 Fuse bits ............................................................................................................360
30.3 Signature bytes .................................................................................................362
30.4 Calibration byte .................................................................................................362
30.5 Parallel programming parameters, pin mapping, and commands .....................362
30.6 Parallel programming ........................................................................................365
30.7 Serial downloading ............................................................................................373
30.8 Serial programming pin mapping ......................................................................374
30.9 Programming via the JTAG interface ................................................................377
31 Electrical characteristics for Atmel AT90USB64/128 ....................... 390
31.1 Absolute maximum ratings* ...............................................................................390
31.2 DC characteristics .............................................................................................390
31.3 External clock drive waveforms .........................................................................392
31.4 External clock drive ...........................................................................................392
31.5 Maximum speed vs. V
CC ........................................................................................................................... 392
31.6 2-wire serial interface characteristics ................................................................393
31.7 SPI timing characteristics ..................................................................................395
31.8 Hardware boot entrance timing characteristics .................................................396
31.9 ADC characteristics ...........................................................................................397
31.10 External data memory timing ...........................................................................399
32 Atmel AT90USB64/128 typical characteristics ................................. 404