ATmega644PA datasheet(465/468 Pages) ATMEL

465 / 468 page

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

20.3Data Transfer and Frame Format ........................................................................210

20.4Multi-master Bus Systems, Arbitration and Synchronization ...............................213

20.5Overview of the TWI Module ...............................................................................215

20.6Using the TWI ......................................................................................................217

20.7Transmission Modes ...........................................................................................220

20.8Multi-master Systems and Arbitration ..................................................................233

20.9Register Description ............................................................................................234

AC - Analog Comparator ..................................................................... 239

21.1Overview .............................................................................................................239

21.2Analog Comparator Multiplexed Input .................................................................239

21.3Register Description ............................................................................................240

ADC - Analog-to-digital Converter ..................................................... 242

22.1Features ..............................................................................................................242

22.2Overview .............................................................................................................242

22.3Operation .............................................................................................................243

22.4Starting a Conversion ..........................................................................................244

22.5Prescaling and Conversion Timing ......................................................................245

22.6Changing Channel or Reference Selection .........................................................248

22.7ADC Noise Canceler ...........................................................................................250

22.8ADC Conversion Result ......................................................................................255

22.9Register Description ............................................................................................257

JTAG Interface and On-chip Debug System ..................................... 262

23.1Features ..............................................................................................................262

23.2Overview .............................................................................................................262

23.3TAP – Test Access Port ......................................................................................262

23.4TAP Controller .....................................................................................................264

23.5Using the Boundary-scan Chain ..........................................................................265

23.6Using the On-chip Debug System .......................................................................265

23.7On-chip Debug Specific JTAG Instructions .........................................................266

23.8Using the JTAG Programming Capabilities .........................................................266

23.9Bibliography .........................................................................................................267

23.10Register Description ..........................................................................................267

IEEE 1149.1 (JTAG) Boundary-scan ................................................... 268

24.1Features ..............................................................................................................268

24.2Overview .............................................................................................................268

ATmega644PA Datasheet(PDF) 465 Page - ATMEL Corporation