AT90USB646 datasheet(428/434 Pages) ATMEL

428 / 434 page

7593A–AVR–02/06

AT90USB64/128

16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3) ........... 118

14.1

Overview ..........................................................................................................118

14.2

Accessing 16-bit Registers ..............................................................................120

14.3

Timer/Counter Clock Sources ..........................................................................123

14.4

Counter Unit .....................................................................................................123

14.5

Input Capture Unit ............................................................................................125

14.6

Output Compare Units .....................................................................................127

14.7

Compare Match Output Unit ............................................................................128

14.8

Modes of Operation .........................................................................................130

14.9

Timer/Counter Timing Diagrams ......................................................................137

14.10 16-bit Timer/Counter Register Description .......................................................139

8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 150

15.1

Overview ..........................................................................................................150

15.2

Timer/Counter Clock Sources ..........................................................................151

15.3

Counter Unit .....................................................................................................151

15.4

Output Compare Unit .......................................................................................152

15.5

Compare Match Output Unit ............................................................................154

15.6

Modes of Operation .........................................................................................155

15.7

Timer/Counter Timing Diagrams ......................................................................159

15.8

8-bit Timer/Counter Register Description .........................................................161

15.9

Asynchronous operation of the Timer/Counter ................................................166

15.10 Timer/Counter Prescaler ..................................................................................170

Output Compare Modulator (OCM1C0A) ........................................... 171

16.1

Overview ..........................................................................................................171

16.2

Description .......................................................................................................171

Serial Peripheral Interface – SPI ......................................................... 173

17.1

SS Pin Functionality .........................................................................................177

17.2

Data Modes ......................................................................................................180

USART ................................................................................................... 182

18.1

Overview ..........................................................................................................182

18.2

Clock Generation .............................................................................................183

18.3

Frame Formats ................................................................................................186

18.4

USART Initialization .........................................................................................188

18.5

Data Transmission – The USART Transmitter ................................................189

18.6

Data Reception – The USART Receiver ..........................................................191

AT90USB646 Datasheet(PDF) 428 Page - ATMEL Corporation

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