v
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
21.5Frame Formats ....................................................................................................208
21.6Data Transfer ......................................................................................................210
21.7AVR USART MSPIM vs. AVR SPI ......................................................................212
21.8Register Description ............................................................................................213
22 2-wire Serial Interface .......................................................................... 216
22.1Features ..............................................................................................................216
22.22-wire Serial Interface Bus Definition ..................................................................216
22.3Data Transfer and Frame Format ........................................................................218
22.4Multi-master Bus Systems, Arbitration and Synchronization ...............................220
22.5Overview of the TWI Module ...............................................................................223
22.6Using the TWI ......................................................................................................225
22.7Transmission Modes ...........................................................................................229
22.8Multi-master Systems and Arbitration ..................................................................242
22.9Register Description ............................................................................................243
23 Analog Comparator ............................................................................. 248
23.1Overview .............................................................................................................248
23.2Analog Comparator Multiplexed Input .................................................................248
23.3Register Description ............................................................................................249
24 Analog-to-Digital Converter ................................................................ 252
24.1Features ..............................................................................................................252
24.2Overview .............................................................................................................252
24.3Starting a Conversion ..........................................................................................254
24.4Prescaling and Conversion Timing ......................................................................255
24.5Changing Channel or Reference Selection .........................................................257
24.6ADC Noise Canceler ...........................................................................................258
24.7ADC Conversion Result ......................................................................................263
24.8Temperature Measurement .................................................................................263
24.9Register Description ............................................................................................264
25 debugWIRE On-chip Debug System .................................................. 269
25.1Features ..............................................................................................................269
25.2Overview .............................................................................................................269
25.3Physical Interface ................................................................................................269
25.4Software Break Points .........................................................................................270
25.5Limitations of debugWIRE ...................................................................................270
25.6Register Description ............................................................................................270
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