ii
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
9.6Calibrated Internal RC Oscillator .............................................................................34
9.7128kHz Internal Oscillator .......................................................................................35
9.8External Clock .........................................................................................................35
9.9Clock Output Buffer .................................................................................................36
9.10Timer/Counter Oscillator .......................................................................................36
9.11System Clock Prescaler ........................................................................................36
9.12Register Description ..............................................................................................38
10 Power Management and Sleep Modes ................................................. 40
10.1Sleep Modes .........................................................................................................40
10.2BOD Disable
(1)
.......................................................................................................41
10.3Idle Mode ...............................................................................................................41
10.4ADC Noise Reduction Mode .................................................................................41
10.5Power-down Mode ................................................................................................42
10.6Power-save Mode .................................................................................................42
10.7Standby Mode .......................................................................................................42
10.8Extended Standby Mode .......................................................................................43
10.9Power Reduction Register .....................................................................................43
10.10Minimizing Power Consumption ..........................................................................43
10.11Register Description ............................................................................................45
11 System Control and Reset .................................................................... 48
11.1Resetting the AVR .................................................................................................48
11.2Reset Sources .......................................................................................................48
11.3Power-on Reset .....................................................................................................49
11.4External Reset .......................................................................................................50
11.5Brown-out Detection ..............................................................................................50
11.6Watchdog System Reset .......................................................................................51
11.7Internal Voltage Reference ....................................................................................51
11.8Watchdog Timer ....................................................................................................52
11.9Register Description ..............................................................................................56
12 Interrupts ................................................................................................ 59
12.1Interrupt Vectors in ATmega48A and ATmega48PA .............................................59
12.2Interrupt Vectors in ATmega88A and ATmega88PA .............................................61
12.3Interrupt Vectors in ATmega168A and ATmega168PA .........................................64
12.4Interrupt Vectors in ATmega328 and ATmega328P .............................................67
12.5Register Description ..............................................................................................70
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