ATmega328P datasheet(442/448 Pages) ATMEL

442 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

8.7128 kHz Internal Oscillator ......................................................................................34

8.8External Clock .........................................................................................................34

8.9Clock Output Buffer .................................................................................................35

8.10Timer/Counter Oscillator .......................................................................................35

8.11System Clock Prescaler ........................................................................................35

8.12Register Description ..............................................................................................37

Power Management and Sleep Modes ................................................. 39

9.1Sleep Modes ...........................................................................................................39

9.2BOD Disable ............................................................................................................40

9.3Idle Mode .................................................................................................................40

9.4ADC Noise Reduction Mode ...................................................................................40

9.5Power-down Mode ..................................................................................................41

9.6Power-save Mode ...................................................................................................41

9.7Standby Mode .........................................................................................................41

9.8Extended Standby Mode .........................................................................................41

9.9Power Reduction Register .......................................................................................42

9.10Minimizing Power Consumption ............................................................................42

9.11Register Description ..............................................................................................44

System Control and Reset .................................................................... 46

10.1Resetting the AVR .................................................................................................46

10.2Reset Sources .......................................................................................................46

10.3Power-on Reset .....................................................................................................47

10.4External Reset .......................................................................................................48

10.5Brown-out Detection ..............................................................................................48

10.6Watchdog System Reset .......................................................................................49

10.7Internal Voltage Reference ....................................................................................49

10.8Watchdog Timer ....................................................................................................50

10.9Register Description ..............................................................................................54

Interrupts ................................................................................................ 57

11.1Interrupt Vectors in ATmega48PA .........................................................................57

11.2Interrupt Vectors in ATmega88PA .........................................................................59

11.3Interrupt Vectors in ATmega168PA .......................................................................62

11.4Interrupt Vectors in ATmega328P .........................................................................65

11.5Register Description ..............................................................................................68

External Interrupts ................................................................................. 70

ATmega328P Datasheet(PDF) 442 Page - ATMEL Corporation