ATmega64A datasheet(388/392 Pages) ATMEL

388 / 392 page

8160C–AVR–07/09

ATmega64A

19.1

Features ........................................................................................................164

19.2

Overview ........................................................................................................164

19.3

SS Pin Functionality ......................................................................................169

19.4

Data Modes ...................................................................................................169

19.5

USART ................................................................................................... 174

20.1

Features ........................................................................................................174

20.2

Overview ........................................................................................................174

20.3

Clock Generation ...........................................................................................176

20.4

Frame Formats ..............................................................................................178

20.5

USART Initialization .......................................................................................179

20.6

Data Transmission – The USART Transmitter ..............................................181

20.7

Data Reception – The USART Receiver .......................................................183

20.8

Asynchronous Data Reception ......................................................................187

20.9

Multi-processor Communication Mode ..........................................................190

20.10

Examples of Baud Rate Setting .....................................................................192

20.11

TWI – Two-wire Serial Interface .......................................................... 201

21.1

Features ........................................................................................................201

21.2

Overview ........................................................................................................201

21.3

Two-wire Serial Interface Bus Definition ........................................................203

21.4

Data Transfer and Frame Format ..................................................................204

21.5

Multi-master Bus Systems, Arbitration and Synchronization .........................207

21.6

Using the TWI ................................................................................................209

21.7

Transmission Modes .....................................................................................212

21.8

Multi-master Systems and Arbitration ............................................................225

21.9

TWI Register Description ...............................................................................226

Analog Comparator .............................................................................. 230

22.1

Analog Comparator Multiplexed Input ...........................................................230

22.2

Analog to Digital Converter ................................................................. 233

23.1

Features ........................................................................................................233

23.2

Overview ........................................................................................................233

23.3

Operation .......................................................................................................234

23.4

Starting a Conversion ....................................................................................235

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