ATmega1284P datasheet(377/380 Pages) ATMEL

377 / 380 page

8059D–AVR–11/09

ATmega1284P

20.1Overview .............................................................................................................237

20.2Analog Comparator Multiplexed Input .................................................................237

20.3Register Description ............................................................................................238

ADC - Analog-to-digital Converter ..................................................... 240

21.1Features ..............................................................................................................240

21.2Overview .............................................................................................................240

21.3Operation .............................................................................................................241

21.4Starting a Conversion ..........................................................................................242

21.5Prescaling and Conversion Timing ......................................................................243

21.6Changing Channel or Reference Selection .........................................................246

21.7ADC Noise Canceler ...........................................................................................248

21.8ADC Conversion Result ......................................................................................253

21.9Register Description ............................................................................................255

JTAG Interface and On-chip Debug System ..................................... 260

22.1Features ..............................................................................................................260

22.2Overview .............................................................................................................260

22.3TAP – Test Access Port ......................................................................................260

22.4TAP Controller .....................................................................................................262

22.5Using the Boundary-scan Chain ..........................................................................263

22.6Using the On-chip Debug System .......................................................................263

22.7On-chip Debug Specific JTAG Instructions .........................................................264

22.8Using the JTAG Programming Capabilities .........................................................264

22.9Bibliography .........................................................................................................265

22.10Register Description ..........................................................................................265

IEEE 1149.1 (JTAG) Boundary-scan ................................................... 266

23.1Features ..............................................................................................................266

23.2Overview .............................................................................................................266

23.3Data Registers .....................................................................................................267

23.4Boundary-scan Specific JTAG Instructions .........................................................268

23.5Boundary-scan Chain ..........................................................................................269

23.6ATmega1284P Boundary-scan Order .................................................................272

23.7Boundary-scan Description Language Files ........................................................274

23.8Register Description ............................................................................................275

Boot Loader Support – Read-While-Write Self-Programming ......... 276

24.1Features ..............................................................................................................276

ATmega1284P Datasheet(PDF) 377 Page - ATMEL Corporation