AT90USB646 datasheet(432/435 Pages) ATMEL

432 / 435 page

7593D–AVR–07/06

AT90USB64/128

23.16Registers ...........................................................................................................300

Analog Comparator .............................................................................. 313

24.1Analog Comparator Multiplexed Input .................................................................315

Analog to Digital Converter - ADC ...................................................... 316

25.1Features ..............................................................................................................316

25.2Operation .............................................................................................................317

25.3Starting a Conversion ..........................................................................................318

25.4Prescaling and Conversion Timing ......................................................................319

25.5Changing Channel or Reference Selection .........................................................322

25.6ADC Noise Canceler ...........................................................................................323

25.7ADC Conversion Result .......................................................................................327

25.8ADC Register Description ....................................................................................329

JTAG Interface and On-chip Debug System ...................................... 335

26.1Overview ..............................................................................................................335

26.2Test Access Port – TAP ......................................................................................335

26.3TAP Controller .....................................................................................................337

26.4Using the Boundary-scan Chain ..........................................................................338

26.5Using the On-chip Debug System .......................................................................338

26.6On-chip Debug Specific JTAG Instructions .........................................................339

26.7On-chip Debug Related Register in I/O Memory .................................................340

26.8Using the JTAG Programming Capabilities .........................................................340

26.9Bibliography .........................................................................................................340

IEEE 1149.1 (JTAG) Boundary-scan ................................................... 341

27.1Features ..............................................................................................................341

27.2System Overview .................................................................................................341

27.3Data Registers .....................................................................................................341

27.4Boundary-scan Specific JTAG Instructions .........................................................343

27.5Boundary-scan Related Register in I/O Memory .................................................344

27.6Boundary-scan Chain ..........................................................................................345

27.7AT90USB64/128 Boundary-scan Order ..............................................................348

27.8Boundary-scan Description Language Files ........................................................351

Boot Loader Support – Read-While-Write Self-Programming ......... 352

28.1Boot Loader Features ..........................................................................................352

28.2Application and Boot Loader Flash Sections .......................................................352

AT90USB646 Datasheet(PDF) 432 Page - ATMEL Corporation