Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002061A-page 4
ATmega48A/PA/88A/PA/168A/PA/328/P
9.8 External Clock ................................................................................................. 44
9.9 Clock Output Buffer ......................................................................................... 45
9.10 Timer/Counter Oscillator.................................................................................. 45
9.11 System Clock Prescaler .................................................................................. 45
9.12 Register Description ........................................................................................ 46
10 Power Management and Sleep Modes ................................................................... 48
10.1 Sleep Modes.................................................................................................... 48
10.2 BOD Disable
(1)
................................................................................................ 49
10.3 Idle Mode......................................................................................................... 49
10.4 ADC Noise Reduction Mode............................................................................ 49
10.5 Power-down Mode........................................................................................... 49
10.6 Power-save Mode............................................................................................ 50
10.7 Standby Mode ................................................................................................. 50
10.8 Extended Standby Mode ................................................................................. 51
10.9 Power Reduction Register............................................................................... 51
10.10 Minimizing Power Consumption ...................................................................... 51
10.11 Register Description ........................................................................................ 53
11 System Control and Reset ............................................................................................. 56
11.1 Resetting the AVR ........................................................................................... 56
11.2 Reset Sources ................................................................................................. 56
11.3 Power-on Reset............................................................................................... 57
11.4 External Reset ................................................................................................. 58
11.5 Brown-out Detection ........................................................................................ 58
11.6 Watchdog System Reset ................................................................................. 59
11.7 Internal Voltage Reference.............................................................................. 59
11.8 Watchdog Timer .............................................................................................. 60
11.9 Register Description ........................................................................................ 63
12 Interrupts ................................................................................................................................... 66
12.1 Interrupt Vectors in ATmega48A and ATmega48PA....................................... 66
12.2 Interrupt Vectors in ATmega88A and ATmega88PA....................................... 68
12.3 Interrupt Vectors in ATmega168A and ATmega168PA ................................... 71
12.4 Interrupt Vectors in ATmega328 and ATmega328P........................................ 74
12.5 Register Description ........................................................................................ 77
13 External Interrupts .............................................................................................................. 79
13.1 Pin Change Interrupt Timing............................................................................ 79