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
19 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
20 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
21 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
4
7593A–AVR–02/06
ATMEL [ ATMEL ]
