ATMEGA640 datasheet(433/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

2549Q–AVR–02/2014

24.1Features ..............................................................................................................236

24.22-wire Serial Interface Bus Definition ..................................................................236

24.3Data Transfer and Frame Format ........................................................................237

24.4Multi-master Bus Systems, Arbitration, and Synchronization ..............................239

24.5Overview of the TWI Module ...............................................................................241

24.6Using the TWI ......................................................................................................244

24.7Transmission Modes ...........................................................................................247

24.8Multi-master Systems and Arbitration ..................................................................259

24.9Register Description ............................................................................................261

25 AC – Analog Comparator ..................................................................... 265

25.1Analog Comparator Multiplexed Input .................................................................265

25.2Register Description ............................................................................................266

26 ADC – Analog to Digital Converter ..................................................... 268

26.1Features ..............................................................................................................268

26.2Operation .............................................................................................................269

26.3Starting a Conversion ..........................................................................................270

26.4Prescaling and Conversion Timing ......................................................................271

26.5Changing Channel or Reference Selection .........................................................274

26.6ADC Noise Canceler ...........................................................................................275

26.7ADC Conversion Result .......................................................................................280

26.8Register Description ............................................................................................281

27 JTAG Interface and On-chip Debug System ...................................... 289

27.1Features ..............................................................................................................289

27.2Overview ..............................................................................................................289

27.3TAP - Test Access Port .......................................................................................290

27.4Using the Boundary-scan Chain ..........................................................................292

27.5Using the On-chip Debug System .......................................................................292

27.6On-chip Debug Specific JTAG Instructions .........................................................293

27.7Using the JTAG Programming Capabilities .........................................................293

27.8Bibliography .........................................................................................................294

27.9On-chip Debug Related Register in I/O Memory .................................................294

28 IEEE 1149.1 (JTAG) Boundary-scan ................................................... 295

28.1Features ..............................................................................................................295

28.2System Overview .................................................................................................295

28.3Data Registers .....................................................................................................295

ATMEGA640 Datasheet(PDF) 433 Page - Microchip Technology