AT90USB646 datasheet(454/459 Pages) ATMEL

454 / 459 page

454

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

18.8 Multi-processor Communication Mode ..............................................................197

18.9 USART Register Description .............................................................................198

18.10 Examples of Baud Rate Setting .......................................................................203

USART in SPI Mode ............................................................................. 206

19.1 Overview ............................................................................................................206

19.2 Clock Generation ...............................................................................................207

19.3 SPI Data Modes and Timing ..............................................................................207

19.4 Frame Formats ..................................................................................................208

19.5 Data Transfer .....................................................................................................210

19.6 USART MSPIM Register Description ................................................................212

19.7 AVR USART MSPIM vs. AVR SPI ....................................................................214

2-wire Serial Interface .......................................................................... 216

20.1 Features ............................................................................................................216

20.2 2-wire Serial Interface Bus Definition ................................................................216

20.3 Data Transfer and Frame Format ......................................................................217

20.4 Multi-master Bus Systems, Arbitration and Synchronization .............................220

20.5 Overview of the TWI Module .............................................................................221

20.6 TWI Register Description ...................................................................................224

20.7 Using the TWI ....................................................................................................227

20.8 Transmission Modes .........................................................................................231

20.9 Multi-master Systems and Arbitration ................................................................244

USB controller ...................................................................................... 246

21.1 Features ............................................................................................................246

21.2 Block Diagram ...................................................................................................246

21.3 Typical Application Implementation ...................................................................247

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

21.5 Power modes .....................................................................................................255

21.6 Speed Control ....................................................................................................256

21.7 Memory management ........................................................................................257

21.8 PAD suspend .....................................................................................................258

21.9 OTG timers customizing ....................................................................................259

21.10 Plug-in detection ..............................................................................................259

21.11 ID detection .....................................................................................................260

21.12 Registers description .......................................................................................261

21.13 USB Software Operating modes .....................................................................266

AT90USB646 Datasheet(PDF) 454 Page - ATMEL Corporation