Datasheet
338
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
8.7 128 kHz Internal Oscillator ..............................................................................32
8.8 External Clock .................................................................................................33
8.9 Clock Output Buffer .........................................................................................34
8.10 Timer/Counter Oscillator ..................................................................................34
8.11 System Clock Prescaler ..................................................................................34
8.12 Register Description ........................................................................................35
9 Power Management and Sleep Modes ................................................. 37
9.1 Sleep Modes ....................................................................................................37
9.2 BOD Disable ....................................................................................................38
9.3 Idle Mode .........................................................................................................38
9.4 ADC Noise Reduction Mode ............................................................................38
9.5 Power-down Mode ...........................................................................................39
9.6 Power-save Mode ............................................................................................39
9.7 Standby Mode .................................................................................................39
9.8 Extended Standby Mode .................................................................................39
9.9 Power Reduction Register ...............................................................................40
9.10 Minimizing Power Consumption ......................................................................40
9.11 Register Description ........................................................................................42
10 System Control and Reset .................................................................... 44
10.1 Resetting the AVR ...........................................................................................44
10.2 Reset Sources .................................................................................................44
10.3 Power-on Reset ...............................................................................................45
10.4 External Reset .................................................................................................47
10.5 Brown-out Detection ........................................................................................47
10.6 Watchdog System Reset .................................................................................48
10.7 Internal Voltage Reference ..............................................................................48
10.8 Watchdog Timer ..............................................................................................49
10.9 Register Description ........................................................................................53
11 Interrupts ................................................................................................ 56
11.1 Interrupt Vectors in ATmega328P ...................................................................56
11.2 Register Description ........................................................................................59
12 External Interrupts ................................................................................. 61
12.1 Pin Change Interrupt Timing ............................................................................61
12.2 Register Description ........................................................................................62