Datasheet

ii
8272A–AVR–01/10
164A/164PA/324A/324PA/644A/644PA/1284/1284P
8.3Low Power Crystal Oscillator ...................................................................................33
8.4Full Swing Crystal Oscillator ....................................................................................34
8.5Low Frequency Crystal Oscillator ............................................................................35
8.6Calibrated Internal RC Oscillator .............................................................................37
8.7128 kHz Internal Oscillator ......................................................................................38
8.8External Clock .........................................................................................................38
8.9Timer/Counter Oscillator .........................................................................................39
8.10Clock Output Buffer ...............................................................................................39
8.11System Clock Prescaler ........................................................................................40
8.12Register Description ..............................................................................................41
9 Power Management and Sleep Modes ................................................. 43
9.1Overview .................................................................................................................43
9.2Sleep Modes ...........................................................................................................43
9.3BOD Disable
(1)
.........................................................................................................44
9.4Idle Mode .................................................................................................................44
9.5ADC Noise Reduction Mode ...................................................................................44
9.6Power-down Mode ..................................................................................................45
9.7Power-save Mode ...................................................................................................45
9.8Standby Mode .........................................................................................................45
9.9Extended Standby Mode .........................................................................................45
9.10Power Reduction Register .....................................................................................46
9.11Minimizing Power Consumption ............................................................................46
9.12Register Description ..............................................................................................48
10 System Control and Reset .................................................................... 51
10.1Resetting the AVR .................................................................................................51
10.2Internal Voltage Reference ....................................................................................55
10.3Watchdog Timer ....................................................................................................56
10.4Register Description ..............................................................................................59
11 Interrupts ................................................................................................ 62
11.1Overview ...............................................................................................................62
11.2Interrupt Vectors in ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P ..
62
11.3Register Description ..............................................................................................66
12 External Interrupts ................................................................................. 68
12.1Overview ...............................................................................................................68