ATmega48/88/168

21.22线串行接口总线定义........................................... ....................... 208

21.3Data传输和帧格式............................................ ............................ 209

21.4Multi主机总线系统，仲裁和同步............................... 212

TWI模块的21.5Overview ............................................ ................................... 215

21.6Using的TWI ......................................................................................................217

21.7Transmission模式............................................... ............................................ 221

21.8Multi主机系统和仲裁........................................... ....................... 234

21.9Register说明............................................... ............................................. 235

22模拟比较器............................................... ............................... 240

22.1Overview ..............................................................................................................240

22.2Analog比较器多路输入............................................. .................... 240

22.3Register说明............................................... ............................................. 241

23模拟数字转换器........................................... ..................... 243

23.1Features ..............................................................................................................243

23.2Overview ..............................................................................................................243

23.3Starting一个转换.............................................. ............................................ 245

23.4Prescaling和转换时序............................................. ......................... 246

23.5Changing通道或基准选择............................................ ............. 248

23.6ADC噪声消除.............................................. ............................................. 249

23.7ADC转换结果.............................................. ......................................... 254

23.8Register说明............................................... ............................................. 254

24 debugWIRE的片上调试系统........................................... 259 .......

24.1Features ..............................................................................................................259

24.2Overview ..............................................................................................................259

24.3Physical接口............................................... ................................................. 259

24.4Software断点.............................................. ........................................... 260

debugWIRE片的24.5Limitations .............................................. ..................................... 260

24.6Register说明............................................... ............................................. 260

25自编程闪存， ATmega48中.......................................... 。 261

25.1Overview ..............................................................................................................261

25.2Addressing闪存在自编程.......................................... 262 .......

25.3Register说明............................................... ............................................. 266

26支持引导装入程序 - 同时读 - 写自编程，ATmega88与ATmega168

268

26.1Features ..............................................................................................................268

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2545S–AVR–07/10