AT90USB646 datasheet(428/435 Pages) ATMEL

428 / 435 page

7593D–AVR–07/06

AT90USB64/128

7.1Idle Mode .................................................................................................................54

7.2ADC Noise Reduction Mode ....................................................................................54

7.3Power-down Mode ...................................................................................................54

7.4Power-save Mode ....................................................................................................54

7.5Standby Mode .........................................................................................................55

7.6Extended Standby Mode .........................................................................................55

7.7Power Reduction Register .......................................................................................56

7.8Minimizing Power Consumption ..............................................................................57

System Control and Reset .................................................................... 59

8.1Internal Voltage Reference ......................................................................................64

8.2Watchdog Timer ......................................................................................................64

Interrupts ................................................................................................ 70

9.1Interrupt Vectors in AT90USB64/128 ......................................................................70

I/O-Ports .................................................................................................. 74

10.1Introduction ............................................................................................................74

10.2Ports as General Digital I/O ...................................................................................75

10.3Alternate Port Functions ........................................................................................79

10.4Register Description for I/O-Ports ..........................................................................92

External Interrupts ................................................................................. 96

Timer/Counter0, Timer/Counter1, and Timer/Counter3 Prescalers . 100

12.1Internal Clock Source ..........................................................................................100

12.2Prescaler Reset ...................................................................................................100

12.3External Clock Source .........................................................................................100

12.4General Timer/Counter Control Register – GTCCR ............................................101

8-bit Timer/Counter0 with PWM .......................................................... 102

13.1Overview ..............................................................................................................102

13.2Timer/Counter Clock Sources .............................................................................103

13.3Counter Unit ........................................................................................................103

13.4Output Compare Unit ...........................................................................................104

13.5Compare Match Output Unit ................................................................................106

13.6Modes of Operation .............................................................................................107

13.7Timer/Counter Timing Diagrams .........................................................................111

13.88-bit Timer/Counter Register Description ............................................................112

16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3) ........... 119

AT90USB646 Datasheet(PDF) 428 Page - ATMEL Corporation