ATmega325P datasheet(360/364 Pages) ATMEL

360 / 364 page

8023F–AVR–07/09

ATmega325P/3250P

16.9Asynchronous Operation of Timer/Counter2 .......................................................147

16.10Register Description ..........................................................................................149

SPI – Serial Peripheral Interface ......................................................... 154

17.1Features ..............................................................................................................154

17.2Overview .............................................................................................................154

17.3SS Pin Functionality ............................................................................................159

17.4Data Modes .........................................................................................................159

17.5Register Description ............................................................................................160

USART0 ................................................................................................. 163

18.1Features ..............................................................................................................163

18.2Overview .............................................................................................................163

18.3Clock Generation .................................................................................................165

18.4Frame Formats ....................................................................................................168

18.5USART Initialization ............................................................................................169

18.6Data Transmission – The USART Transmitter ....................................................171

18.7Data Reception – The USART Receiver .............................................................173

18.8Asynchronous Data Reception ............................................................................177

18.9Multi-processor Communication Mode ................................................................180

18.10Register Description ..........................................................................................182

18.11Examples of Baud Rate Setting ........................................................................186

USI – Universal Serial Interface .......................................................... 191

19.1Features ..............................................................................................................191

19.2Overview .............................................................................................................191

19.3Functional Descriptions .......................................................................................192

19.4Alternative USI Usage .........................................................................................198

19.5Register Descriptions ..........................................................................................199

Analog Comparator ............................................................................. 203

20.1Overview .............................................................................................................203

20.2Analog Comparator Multiplexed Input .................................................................203

20.3Register Description ............................................................................................204

Analog to Digital Converter ................................................................ 206

21.1Features ..............................................................................................................206

21.2Overview .............................................................................................................206

21.3Operation .............................................................................................................207

ATmega325P Datasheet(PDF) 360 Page - ATMEL Corporation