ATMega chip full datasheet - UCSD Department of Physics

ATmega48A/PA/88A/PA/168A/PA/328/P9.6Calibrated Internal RC Oscillator .............................................................................349.7128kHz Internal Oscillator .......................................................................................359.8External Clock .........................................................................................................359.9Clock Output Buffer .................................................................................................369.10Timer/Counter Oscillator .......................................................................................369.11System Clock Prescaler ........................................................................................369.12Register Description ..............................................................................................3810 Power Management and Sleep Modes ................................................. 4010.1Sleep Modes .........................................................................................................4010.2BOD Disable (1) .......................................................................................................4110.3Idle Mode ...............................................................................................................4110.4ADC Noise Reduction Mode .................................................................................4110.5Power-down Mode ................................................................................................4210.6Power-save Mode .................................................................................................4210.7Standby Mode .......................................................................................................4210.8Extended Standby Mode .......................................................................................4310.9Power Reduction Register .....................................................................................4310.10Minimizing Power Consumption ..........................................................................4310.11Register Description ............................................................................................4511 System Control and Reset .................................................................... 4811.1Resetting the AVR .................................................................................................4811.2Reset Sources .......................................................................................................4811.3Power-on Reset .....................................................................................................4911.4External Reset .......................................................................................................5011.5Brown-out Detection ..............................................................................................5011.6Watchdog System Reset .......................................................................................5111.7Internal Voltage Reference ....................................................................................5111.8Watchdog Timer ....................................................................................................5211.9Register Description ..............................................................................................5612 Interrupts ................................................................................................ 5912.1Interrupt Vectors in ATmega48A and ATmega48PA .............................................5912.2Interrupt Vectors in ATmega88A and ATmega88PA .............................................6112.3Interrupt Vectors in ATmega168A and ATmega168PA .........................................6412.4Interrupt Vectors in ATmega328 and ATmega328P .............................................6712.5Register Description ..............................................................................................708271D–AVR–05/11ii