AT90USB646 datasheet(452/459 Pages) ATMEL

452 / 459 page

452

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

7.1 Idle Mode ...............................................................................................................52

7.2 ADC Noise Reduction Mode ..................................................................................52

7.3 Power-down Mode .................................................................................................52

7.4 Power-save Mode ..................................................................................................52

7.5 Standby Mode .......................................................................................................53

7.6 Extended Standby Mode .......................................................................................53

7.7 Power Reduction Register .....................................................................................54

7.8 Minimizing Power Consumption ............................................................................55

System Control and Reset .................................................................... 57

8.1 Internal Voltage Reference ....................................................................................62

8.2 Watchdog Timer ....................................................................................................63

Interrupts ................................................................................................ 68

9.1 Interrupt Vectors in ATmega32U6/AT90USB64/128 .............................................68

I/O-Ports .................................................................................................. 72

10.1 Introduction ..........................................................................................................72

10.2 Ports as General Digital I/O .................................................................................73

10.3 Alternate Port Functions ......................................................................................77

10.4 Register Description for I/O-Ports ........................................................................90

External Interrupts ................................................................................. 94

Timer/Counter0, Timer/Counter1, and Timer/Counter3 Prescalers ... 98

12.1 Internal Clock Source ..........................................................................................98

12.2 Prescaler Reset ...................................................................................................98

12.3 External Clock Source .........................................................................................98

12.4 General Timer/Counter Control Register – GTCCR ............................................99

8-bit Timer/Counter0 with PWM .......................................................... 100

13.1 Overview ............................................................................................................100

13.2 Timer/Counter Clock Sources ...........................................................................101

13.3 Counter Unit ......................................................................................................101

13.4 Output Compare Unit .........................................................................................102

13.5 Compare Match Output Unit ..............................................................................104

13.6 Modes of Operation ...........................................................................................105

13.7 Timer/Counter Timing Diagrams .......................................................................109

13.8 8-bit Timer/Counter Register Description ..........................................................110

16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3) ........... 117

AT90USB646 Datasheet(PDF) 452 Page - ATMEL Corporation