ATmega328P datasheet(445/448 Pages) ATMEL

445 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

20.5Frame Formats ....................................................................................................206

20.6Data Transfer ......................................................................................................208

20.7AVR USART MSPIM vs. AVR SPI ......................................................................210

20.8Register Description ............................................................................................211

2-wire Serial Interface .......................................................................... 214

21.1Features ..............................................................................................................214

21.22-wire Serial Interface Bus Definition ..................................................................214

21.3Data Transfer and Frame Format ........................................................................216

21.4Multi-master Bus Systems, Arbitration and Synchronization ...............................218

21.5Overview of the TWI Module ...............................................................................221

21.6Using the TWI ......................................................................................................223

21.7Transmission Modes ...........................................................................................227

21.8Multi-master Systems and Arbitration ..................................................................240

21.9Register Description ............................................................................................241

Analog Comparator ............................................................................. 246

22.1Overview .............................................................................................................246

22.2Analog Comparator Multiplexed Input .................................................................246

22.3Register Description ............................................................................................247

Analog-to-Digital Converter ................................................................ 250

23.1Features ..............................................................................................................250

23.2Overview .............................................................................................................250

23.3Starting a Conversion ..........................................................................................252

23.4Prescaling and Conversion Timing ......................................................................253

23.5Changing Channel or Reference Selection .........................................................255

23.6ADC Noise Canceler ...........................................................................................256

23.7ADC Conversion Result ......................................................................................261

23.8Temperature Measurement .................................................................................261

23.9Register Description ............................................................................................262

debugWIRE On-chip Debug System .................................................. 267

24.1Features ..............................................................................................................267

24.2Overview .............................................................................................................267

24.3Physical Interface ................................................................................................267

24.4Software Break Points .........................................................................................268

24.5Limitations of debugWIRE ...................................................................................268

24.6Register Description ............................................................................................268

ATmega328P Datasheet(PDF) 445 Page - ATMEL Corporation