AT90USB646 datasheet(429/434 Pages) ATMEL

429 / 434 page

7593A–AVR–02/06

AT90USB64/128

18.7

Asynchronous Data Reception ........................................................................195

18.8

Multi-processor Communication Mode ............................................................198

18.9

USART Register Description ...........................................................................199

18.10 Examples of Baud Rate Setting .......................................................................204

USART in SPI Mode ............................................................................. 207

19.1

Overview ..........................................................................................................207

19.2

Clock Generation .............................................................................................208

19.3

SPI Data Modes and Timing ............................................................................208

19.4

Frame Formats ................................................................................................209

19.5

Data Transfer ...................................................................................................211

19.6

USART MSPIM Register Description ...............................................................213

19.7

AVR USART MSPIM vs. AVR SPI ...................................................................215

2-wire Serial Interface .......................................................................... 217

20.1

Features ...........................................................................................................217

20.2

2-wire Serial Interface Bus Definition ...............................................................217

20.3

Data Transfer and Frame Format ....................................................................218

20.4

Multi-master Bus Systems, Arbitration and Synchronization ...........................221

20.5

Overview of the TWI Module ............................................................................222

20.6

TWI Register Description .................................................................................225

20.7

Using the TWI ..................................................................................................228

20.8

Transmission Modes ........................................................................................232

20.9

Multi-master Systems and Arbitration ..............................................................245

USB controller ...................................................................................... 247

21.1

Features ...........................................................................................................247

21.2

Block Diagram ..................................................................................................247

21.3

Typical Application Implementation .................................................................248

21.4

General Operating Modes ................................................................................251

21.5

Power modes ...................................................................................................256

21.6

Speed Control ..................................................................................................257

21.7

Memory access capability ................................................................................258

21.8

Memory management ......................................................................................258

21.9

PAD suspend ...................................................................................................259

21.10 OTG timers customizing ..................................................................................260

21.11 Plug-in detection ..............................................................................................261

21.12 ID detection ......................................................................................................262

AT90USB646 Datasheet(PDF) 429 Page - ATMEL Corporation

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