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AT90USB64/128
18.7异步数据接收.............................................. .......................... 195
18.8多处理器通信模式............................................ ................ 198
18.9 USART寄存器说明.............................................. ............................. 199
波特率设置的18.10例子............................................ ........................... 204
19 USART在SPI模式............................................. ................................ 207
19.1概述..........................................................................................................207
19.2时钟发生器............................................... .............................................. 208
19.3 SPI数据模式和定时............................................ ................................ 208
19.4帧格式............................................... ................................................. 209
19.5数据传输...................................................................................................211
19.6 USART MSPIM寄存器说明............................................. .................. 213
19.7 AVR USART MSPIM和AVR SPI .......................................... ......................... 215
20 2线串行接口............................................ .............................. 217
20.1特点...........................................................................................................217
20.2 2线串行接口总线定义.......................................... ..................... 217
20.3数据传输和帧格式............................................ ........................ 218
20.4多主机总线系统，仲裁和同步........................... 221
TWI模块20.5概述............................................ ................................ 222
20.6 TWI寄存器说明.............................................. ................................... 225
20.7使用TWI ..................................................................................................228
20.8传输模式............................................... ......................................... 232
20.9多主机系统和仲裁........................................... ................... 245
21 USB控制器............................................... ....................................... 247
21.1特点...........................................................................................................247
21.2框图..................................................................................................247
21.3典型应用的实现.............................................. ................... 248
21.4一般工作模式.............................................. .................................. 251
21.5功率模式...................................................................................................256
21.6速度控制..................................................................................................257
21.7内存访问能力.............................................. .................................. 258
21.8内存管理............................................... ....................................... 258
21.9 PAD暂停...................................................................................................259
21.10 OTG定时器定制.............................................. .................................... 260
21.11插件检测............................................. ................................................. 261
21.12 ID检测......................................................................................................262
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7593A–AVR–02/06
