Datasheet

370
7674F–AVR–09/09
ATmega164P/324P/644P
7.9 Timer/Counter Oscillator ..................................................................................38
7.10 Clock Output Buffer .........................................................................................38
7.11 System Clock Prescaler ..................................................................................38
7.12 Register Description ........................................................................................39
8 Power Management and Sleep Modes ................................................. 41
8.1 Overview ..........................................................................................................41
8.2 Sleep Modes ....................................................................................................41
8.3 BOD Disable ....................................................................................................42
8.4 Idle Mode .........................................................................................................42
8.5 ADC Noise Reduction Mode ............................................................................42
8.6 Power-down Mode ...........................................................................................43
8.7 Power-save Mode ............................................................................................43
8.8 Standby Mode .................................................................................................43
8.9 Extended Standby Mode .................................................................................43
8.10 Power Reduction Register ...............................................................................44
8.11 Minimizing Power Consumption ......................................................................44
8.12 Register Description ........................................................................................46
9 System Control and Reset .................................................................... 49
9.1 Internal Voltage Reference ..............................................................................53
9.2 Watchdog Timer ..............................................................................................54
9.3 Register Description ........................................................................................57
10 Interrupts ................................................................................................ 60
10.1 Overview ..........................................................................................................60
10.2 Interrupt Vectors in ATmega164P/324P/644P ................................................60
10.3 Register Description ........................................................................................64
11 External Interrupts ................................................................................. 66
11.1 Overview ..........................................................................................................66
11.2 Register Description ........................................................................................66
12 I/O-Ports .................................................................................................. 71
12.1 Overview ..........................................................................................................71
12.2 Ports as General Digital I/O .............................................................................72
12.3 Alternate Port Functions ..................................................................................77
12.4 Register Description ........................................................................................90