ATmega325P datasheet(358/364 Pages) ATMEL

358 / 364 page

8023F–AVR–07/09

ATmega325P/3250P

8.6Calibrated Internal RC Oscillator .............................................................................33

8.7External Clock .........................................................................................................34

8.8Clock Output Buffer .................................................................................................35

8.9Timer/Counter Oscillator .........................................................................................35

8.10System Clock Prescaler ........................................................................................35

8.11Register Description ..............................................................................................36

Power Management and Sleep Modes ................................................. 38

9.1Overview .................................................................................................................38

9.2Sleep Modes ...........................................................................................................38

9.3BOD Disable ............................................................................................................39

9.4Idle Mode .................................................................................................................39

9.5ADC Noise Reduction Mode ...................................................................................39

9.6Power-down Mode ..................................................................................................40

9.7Power-save Mode ...................................................................................................40

9.8Standby Mode .........................................................................................................40

9.9Power Reduction Register .......................................................................................40

9.10Minimizing Power Consumption ............................................................................41

9.11Register Description ..............................................................................................43

System Control and Reset .................................................................... 45

10.1Resetting the AVR .................................................................................................45

10.2Reset Sources .......................................................................................................45

10.3Internal Voltage Reference ....................................................................................48

10.4Watchdog Timer ....................................................................................................49

10.5Register Description ..............................................................................................50

Interrupts ................................................................................................ 53

11.1Overview ...............................................................................................................53

11.2Interrupt Vectors ....................................................................................................53

11.3Register Description ..............................................................................................56

External Interrupts ................................................................................. 58

12.1Overview ...............................................................................................................58

12.2Pin Change Interrupt Timing .................................................................................59

12.3Register Description ..............................................................................................59

I/O-Ports .................................................................................................. 63

13.1Overview ...............................................................................................................63

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