AT90USB646 datasheet(453/459 Pages) ATMEL

453 / 459 page

453

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

14.1 Overview ............................................................................................................117

14.2 Accessing 16-bit Registers ................................................................................119

14.3 Timer/Counter Clock Sources ...........................................................................122

14.4 Counter Unit ......................................................................................................122

14.5 Input Capture Unit .............................................................................................124

14.6 Output Compare Units .......................................................................................126

14.7 Compare Match Output Unit ..............................................................................127

14.8 Modes of Operation ...........................................................................................129

14.9 Timer/Counter Timing Diagrams .......................................................................136

14.10 16-bit Timer/Counter Register Description ......................................................138

8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 149

15.1 Overview ............................................................................................................149

15.2 Timer/Counter Clock Sources ...........................................................................150

15.3 Counter Unit ......................................................................................................150

15.4 Output Compare Unit .........................................................................................151

15.5 Compare Match Output Unit ..............................................................................153

15.6 Modes of Operation ...........................................................................................154

15.7 Timer/Counter Timing Diagrams .......................................................................158

15.8 8-bit Timer/Counter Register Description ..........................................................160

15.9 Asynchronous operation of the Timer/Counter ..................................................165

15.10 Timer/Counter Prescaler .................................................................................168

Output Compare Modulator (OCM1C0A) ........................................... 170

16.1 Overview ............................................................................................................170

16.2 Description .........................................................................................................170

Serial Peripheral Interface – SPI ......................................................... 172

17.1 SS Pin Functionality ..........................................................................................176

17.2 Data Modes .......................................................................................................179

USART ................................................................................................... 181

18.1 Overview ............................................................................................................181

18.2 Clock Generation ...............................................................................................182

18.3 Frame Formats ..................................................................................................185

18.4 USART Initialization ...........................................................................................187

18.5 Data Transmission – The USART Transmitter ..................................................188

18.6 Data Reception – The USART Receiver ...........................................................190

18.7 Asynchronous Data Reception ..........................................................................194

AT90USB646 Datasheet(PDF) 453 Page - ATMEL Corporation