Datasheet

ii
8021G–AVR–03/11
ATmega329P/3290P
8.7External Clock .........................................................................................................32
8.8Clock Output Buffer .................................................................................................33
8.9Timer/Counter Oscillator .........................................................................................33
8.10System Clock Prescaler ........................................................................................33
8.11Register Description ..............................................................................................35
9 Power Management and Sleep Modes ................................................. 37
9.1Overview .................................................................................................................37
9.2Sleep Modes ...........................................................................................................37
9.3BOD Disable ............................................................................................................38
9.4Idle Mode .................................................................................................................38
9.5ADC Noise Reduction Mode ...................................................................................38
9.6Power-down Mode ..................................................................................................38
9.7Power-save Mode ...................................................................................................39
9.8Standby Mode .........................................................................................................39
9.9Power Reduction Register .......................................................................................39
9.10Minimizing Power Consumption ............................................................................40
9.11Register Description ..............................................................................................42
10 System Control and Reset .................................................................... 44
10.1Resetting the AVR .................................................................................................44
10.2Reset Sources .......................................................................................................44
10.3Internal Voltage Reference ....................................................................................48
10.4Watchdog Timer ....................................................................................................48
10.5Register Description ..............................................................................................50
11 Interrupts ................................................................................................ 53
11.1Overview ...............................................................................................................53
11.2Interrupt Vectors ....................................................................................................53
11.3Register Description ..............................................................................................57
12 External Interrupts ................................................................................. 58
12.1Overview ...............................................................................................................58
12.2Pin Change Interrupt Timing .................................................................................59
12.3Register Description ..............................................................................................59
13 I/O-Ports .................................................................................................. 63
13.1Overview ...............................................................................................................63
13.2Ports as General Digital I/O ...................................................................................64