AT90USB646 datasheet(429/435 Pages) ATMEL

429 / 435 page

7593D–AVR–07/06

AT90USB64/128

14.1Overview ..............................................................................................................119

14.2Accessing 16-bit Registers ..................................................................................121

14.3Timer/Counter Clock Sources .............................................................................124

14.4Counter Unit ........................................................................................................124

14.5Input Capture Unit ...............................................................................................126

14.6Output Compare Units .........................................................................................128

14.7Compare Match Output Unit ................................................................................129

14.8Modes of Operation .............................................................................................131

14.9Timer/Counter Timing Diagrams .........................................................................138

14.1016-bit Timer/Counter Register Description ........................................................140

8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 151

15.1Overview ..............................................................................................................151

15.2Timer/Counter Clock Sources .............................................................................152

15.3Counter Unit ........................................................................................................152

15.4Output Compare Unit ...........................................................................................153

15.5Compare Match Output Unit ................................................................................155

15.6Modes of Operation .............................................................................................156

15.7Timer/Counter Timing Diagrams .........................................................................160

15.88-bit Timer/Counter Register Description ............................................................162

15.9Asynchronous operation of the Timer/Counter ....................................................167

15.10Timer/Counter Prescaler ...................................................................................171

Output Compare Modulator (OCM1C0A) ........................................... 172

16.1Overview ..............................................................................................................172

16.2Description ...........................................................................................................172

Serial Peripheral Interface – SPI ......................................................... 174

17.1SS Pin Functionality ............................................................................................178

17.2Data Modes .........................................................................................................181

USART ................................................................................................... 183

18.1Overview ..............................................................................................................183

18.2Clock Generation .................................................................................................184

18.3Frame Formats ....................................................................................................187

18.4USART Initialization .............................................................................................189

18.5Data Transmission – The USART Transmitter ....................................................190

18.6Data Reception – The USART Receiver .............................................................192

18.7Asynchronous Data Reception ............................................................................196

AT90USB646 Datasheet(PDF) 429 Page - ATMEL Corporation