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17.6Compare匹配输出单元............................................. ................................... 143
操作17.7Modes .............................................. ............................................... 144
17.8Timer / C时序图............................................ ............................. 148
定时器/计数器的17.9Asynchronous操作........................................... ............ 150
17.10Timer /计数器预分频器............................................. ...................................... 151
17.11Register说明............................................... ........................................... 152
18 SPI - 串行外设接口............................................ ............. 160
18.1Features ..............................................................................................................160
18.2Overview ..............................................................................................................160
18.3SS引脚功能.............................................. .............................................. 165
18.4Data模式.........................................................................................................165
18.5Register说明............................................... ............................................. 167
19 USART0 ................................................ ................................................. 170
19.1Features ..............................................................................................................170
19.2Overview ..............................................................................................................170
19.3Clock代............................................... .................................................. 171
19.4Frame格式....................................................................................................174
19.5USART初始化............................................... .............................................. 176
19.6Data传输 - USART发送........................................... ......... 178
19.7Data接收 - USART接收........................................... .................. 180
19.8Asynchronous数据接收.............................................. .............................. 184
19.9Multi处理器通讯模式............................................ .................... 187
19.10Register说明............................................... ........................................... 189
波特率设置的19.11Examples ............................................ ............................. 193
20 USART在SPI模式............................................. ................................ 198
20.1Features ..............................................................................................................198
20.2Overview ..............................................................................................................198
20.3Clock代............................................... .................................................. 198
20.4SPI数据模式和定时............................................ .................................... 199
20.5Frame格式....................................................................................................199
20.6Data转移.......................................................................................................202
20.7AVR USART MSPIM和AVR SPI .......................................... ............................ 204
20.8Register说明............................................... ............................................. 205
21 2线串行接口............................................ .............................. 208
21.1Features ..............................................................................................................208
iv
ATmega48/88/168
2545R–AVR–07/09
