ATmega325P datasheet(361/364 Pages) ATMEL

361 / 364 page

8023F–AVR–07/09

ATmega325P/3250P

21.4Starting a Conversion ..........................................................................................208

21.5Prescaling and Conversion Timing ......................................................................209

21.6Changing Channel or Reference Selection .........................................................211

21.7ADC Noise Canceler ...........................................................................................212

21.8ADC Conversion Result ......................................................................................216

21.9Register Description ............................................................................................218

JTAG Interface and On-chip Debug System ..................................... 223

22.1Features ..............................................................................................................223

22.2Overview .............................................................................................................223

22.3TAP – Test Access Port ......................................................................................223

22.4TAP Controller .....................................................................................................225

22.5Using the Boundary-scan Chain ..........................................................................226

22.6Using the On-chip Debug System .......................................................................226

22.7On-chip Debug Specific JTAG Instructions .........................................................227

22.8Using the JTAG Programming Capabilities .........................................................227

22.9Bibliography .........................................................................................................228

22.10Register Description ..........................................................................................228

IEEE 1149.1 (JTAG) Boundary-scan ................................................... 229

23.1Features ..............................................................................................................229

23.2Overview .............................................................................................................229

23.3Data Registers .....................................................................................................229

23.4Boundary-scan Specific JTAG Instructions .........................................................231

23.5Boundary-scan Chain ..........................................................................................232

23.6ATmega325P/3250P Boundary-scan Order ........................................................241

23.7Boundary-scan Description Language Files ........................................................254

23.8Register Description ............................................................................................255

Boot Loader Support – Read-While-Write Self-Programming ......... 256

24.1Features ..............................................................................................................256

24.2Overview .............................................................................................................256

24.3Application and Boot Loader Flash Sections .......................................................256

24.4Read-While-Write and No Read-While-Write Flash Sections ..............................257

24.5Boot Loader Lock Bits .........................................................................................259

24.6Entering the Boot Loader Program ......................................................................261

24.7Addressing the Flash During Self-Programming .................................................261

24.8Self-Programming the Flash ................................................................................262

ATmega325P Datasheet(PDF) 361 Page - ATMEL Corporation