Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 4
ATmega164A/PA/324A/PA/644A/PA/1284/P
9.3 Low Power Crystal Oscillator........................................................................... 41
9.4 Full swing Crystal Oscillator ............................................................................ 42
9.5 Low Frequency Crystal Oscillator.................................................................... 43
9.6 Calibrated Internal RC Oscillator ..................................................................... 44
9.7 128kHz internal oscillator ................................................................................ 45
9.8 External clock .................................................................................................. 46
9.9 Timer/Counter Oscillator.................................................................................. 46
9.10 Clock Output Buffer ......................................................................................... 47
9.11 System Clock Prescaler .................................................................................. 47
9.12 Register description......................................................................................... 48
10 Power management and sleep modes ................................................................... 50
10.1 Overview.......................................................................................................... 50
10.2 Sleep Modes.................................................................................................... 50
10.3 BOD disable
(1)
................................................................................................. 51
10.4 Idle mode......................................................................................................... 51
10.5 ADC Noise Reduction mode............................................................................ 51
10.6 Power-down mode........................................................................................... 52
10.7 Power-save mode............................................................................................ 52
10.8 Standby mode ................................................................................................. 52
10.9 Extended Standby mode ................................................................................. 52
10.10 Power Reduction Register............................................................................... 53
10.11 Minimizing Power Consumption ...................................................................... 53
10.12 Register description......................................................................................... 55
11 System Control and Reset ............................................................................................. 58
11.1 Resetting the AVR ........................................................................................... 58
11.2 Internal Voltage Reference.............................................................................. 62
11.3 Watchdog Timer .............................................................................................. 63
11.4 Register description......................................................................................... 66
12 Interrupts ................................................................................................................................... 69
12.1 Overview.......................................................................................................... 69
12.2 Interrupt Vectors in ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P 69
12.3 Register description......................................................................................... 73
13 External Interrupts .............................................................................................................. 75
13.1 Overview.......................................................................................................... 75
13.2 Register description......................................................................................... 76