Datasheet

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ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [DATASHEET]
8284E–AVR–02/2013
9.3Default clock source ................................................................................................30
9.4Calibrated internal RC oscillator ..............................................................................30
9.5XTAL oscillator ........................................................................................................31
9.6Low-frequency XTAL oscillator ................................................................................32
9.7External clock ..........................................................................................................34
9.8Clock Output Buffer .................................................................................................35
9.9Timer/Counter Oscillator ..........................................................................................35
9.10System Clock Prescaler ........................................................................................35
9.11Register Description ..............................................................................................37
10 Power management and sleep modes ................................................. 39
10.1Overview ................................................................................................................39
10.2Sleep modes ..........................................................................................................39
10.3BOD disable
(1)
......................................................................................................39
10.4Idle mode ...............................................................................................................40
10.5ADC Noise Reduction mode ..................................................................................40
10.6Power-down mode .................................................................................................40
10.7Power-save mode ..................................................................................................41
10.8Standby mode .......................................................................................................41
10.9Power Reduction Register .....................................................................................41
10.10Minimizing power consumption ...........................................................................42
10.11Register description .............................................................................................44
11 System control and reset ...................................................................... 46
11.1Resetting the AVR .................................................................................................46
11.2Reset sources ........................................................................................................46
11.3Internal voltage reference ......................................................................................50
11.4Watchdog Timer ....................................................................................................50
11.5Register description ...............................................................................................52
12 Interrupts .................................................................................................55
12.1Overview ................................................................................................................55
12.2Interrupt vectors .....................................................................................................55
12.3Register description ...............................................................................................59
13 External interrupts ................................................................................. 60
13.1Overview ................................................................................................................60
13.2Pin change interrupt timing ....................................................................................61
13.3Register description ...............................................................................................61