361
7647H–AVR–03/12
Atmel ATmega16/32/64/M1/C1
5.10 System Clock Prescaler ...............................................................................37
6 Power Management and Sleep Modes ..............................................40
6.1 Sleep Mode Control Register .......................................................................40
6.2 Idle Mode ......................................................................................................41
6.3 ADC Noise Reduction Mode .........................................................................41
6.4 Power-down Mode ........................................................................................41
6.5 Standby Mode ..............................................................................................42
6.6 Power Reduction Register ............................................................................42
6.7 Minimizing Power Consumption ...................................................................44
7 System Control and Reset ..................................................................46
7.1 Resetting the AVR ........................................................................................46
7.2 Reset Sources ..............................................................................................46
7.3 Internal Voltage Reference ...........................................................................51
7.4 Watchdog Timer ...........................................................................................52
8 Interrupts ..............................................................................................57
8.1 Interrupt Vectors in ATmega16/32/64/M1/C1 ...............................................57
9 I/O-Ports ................................................................................................62
9.1 Introduction ...................................................................................................62
9.2 Ports as General Digital I/O ..........................................................................63
9.3 Alternate Port Functions ...............................................................................67
9.4 Register Description for I/O-Ports .................................................................80
10 External Interrupts ...............................................................................82
10.1 Pin Change Interrupt Timing .........................................................................82
10.2 External Interrupt Control Register A – EICRA .............................................83
11 Timer/Counter0 and Timer/Counter1 Prescalers ..............................87
11.1 Internal Clock Source ...................................................................................87
11.2 Prescaler Reset ............................................................................................87
11.3 External Clock Source ..................................................................................87
12 8-bit Timer/Counter0 with PWM ..........................................................90
12.1 Overview .......................................................................................................90
12.2 Timer/Counter Clock Sources ......................................................................91
12.3 Counter Unit .................................................................................................91
12.4 Output Compare Unit ....................................................................................92
12.5 Compare Match Output Unit .........................................................................94
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