Datasheet

220
7701F–AVR–10/12
Atmel ATtiny24/44/84 [Preliminary]
7.8 128kHz Internal Oscillator ............................................................................31
7.9 System Clock Prescaler ...............................................................................31
7.10 Register Description .....................................................................................32
8 Power Management and Sleep Modes .............................................. 34
8.1 Sleep Modes ................................................................................................34
8.2 Idle Mode .....................................................................................................34
8.3 ADC Noise Reduction Mode ........................................................................35
8.4 Power-down Mode .......................................................................................35
8.5 Standby Mode ..............................................................................................35
8.6 Software BOD Disable .................................................................................35
8.7 Power Reduction Register ...........................................................................36
8.8 Minimizing Power Consumption ...................................................................36
8.9 Register Description .....................................................................................38
9 System Control and Reset .................................................................. 40
9.1 Resetting the AVR ........................................................................................40
9.2 Reset Sources ..............................................................................................40
9.3 Power-on Reset ...........................................................................................41
9.4 External Reset ..............................................................................................42
9.5 Brown-out Detection .....................................................................................43
9.6 Watchdog Reset ...........................................................................................43
9.7 Internal Voltage Reference ..........................................................................44
9.8 Watchdog Timer ...........................................................................................44
9.9 Timed Sequences for Changing the Configuration of the Watchdog Timer .45
9.10 Register Description .....................................................................................46
10 Interrupts .............................................................................................. 50
10.1 Interrupt Vectors ...........................................................................................50
11 External Interrupts .............................................................................. 52
11.1 Pin Change Interrupt Timing ........................................................................52
11.2 Register Description .....................................................................................53
12 I/O Ports ............................................................................................... 56
12.1 Overview ......................................................................................................56
12.2 Ports as General Digital I/O .........................................................................57
12.3 Alternate Port Functions ...............................................................................61
12.4 Register Description .....................................................................................70