ATMEGA640 datasheet(432/436 Pages) MICROCHIP

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

2549Q–AVR–02/2014

19.2Description ...........................................................................................................167

20 8-bit Timer/Counter2 with PWM and Asynchronous Operation ....... 169

20.1Overview ..............................................................................................................169

20.2Timer/Counter Clock Sources .............................................................................170

20.3Counter Unit ........................................................................................................170

20.4Modes of Operation .............................................................................................171

20.5Output Compare Unit ...........................................................................................175

20.6Compare Match Output Unit ................................................................................176

20.7Timer/Counter Timing Diagrams .........................................................................177

20.8Asynchronous Operation of Timer/Counter2 .......................................................179

20.9Timer/Counter Prescaler .....................................................................................180

20.10Register Description ..........................................................................................182

21 SPI – Serial Peripheral Interface ......................................................... 190

21.1SS Pin Functionality ............................................................................................195

21.2Register Description ............................................................................................197

22 USART ................................................................................................... 200

22.1Features ..............................................................................................................200

22.2Overview ..............................................................................................................200

22.3Clock Generation .................................................................................................201

22.4Frame Formats ....................................................................................................204

22.5USART Initialization .............................................................................................205

22.6Data Transmission – The USART Transmitter ....................................................207

22.7Data Reception – The USART Receiver .............................................................209

22.8Asynchronous Data Reception ............................................................................213

22.9Multi-processor Communication Mode ................................................................216

22.10Register Description ..........................................................................................218

22.11Examples of Baud Rate Setting .........................................................................223

23 USART in SPI Mode .............................................................................. 227

23.1Overview ..............................................................................................................227

23.2USART MSPIM vs. SPI .......................................................................................227

23.3SPI Data Modes and Timing ................................................................................228

23.4Frame Formats ....................................................................................................229

23.5Data Transfer .......................................................................................................231

23.6USART MSPIM Register Description ..................................................................232

24 2-wire Serial Interface .......................................................................... 236

ATMEGA640 Datasheet(PDF) 432 Page - Microchip Technology