iii
8025I–AVR–02/09
ATmega48P/88P/168P/328P
10 External Interrupts ................................................................................. 70
10.1Pin Change Interrupt Timing ..................................................................................70
10.2Register Description ..............................................................................................71
11 I/O-Ports .................................................................................................. 75
11.1Overview ................................................................................................................75
11.2Ports as General Digital I/O ...................................................................................76
11.3Alternate Port Functions ........................................................................................80
11.4Register Description ..............................................................................................92
12 8-bit Timer/Counter0 with PWM ............................................................ 94
12.1Features ................................................................................................................94
12.2Overview ................................................................................................................94
12.3Timer/Counter Clock Sources ...............................................................................96
12.4Counter Unit ..........................................................................................................96
12.5Output Compare Unit .............................................................................................97
12.6Compare Match Output Unit ..................................................................................98
12.7Modes of Operation ...............................................................................................99
12.8Timer/Counter Timing Diagrams .........................................................................104
12.9Register Description ............................................................................................106
13 16-bit Timer/Counter1 with PWM ........................................................ 113
13.1Features ..............................................................................................................113
13.2Overview ..............................................................................................................113
13.3Accessing 16-bit Registers ..................................................................................115
13.4Timer/Counter Clock Sources .............................................................................118
13.5Counter Unit ........................................................................................................119
13.6Input Capture Unit ...............................................................................................120
13.7Output Compare Units .........................................................................................122
13.8Compare Match Output Unit ................................................................................124
13.9Modes of Operation .............................................................................................125
13.10Timer/Counter Timing Diagrams .......................................................................132
13.11Register Description ..........................................................................................134
14 Timer/Counter0 and Timer/Counter1 Prescalers .............................. 141
14.1Internal Clock Source ..........................................................................................141
14.2Prescaler Reset ...................................................................................................141
14.3External Clock Source .........................................................................................141
14.4Register Description ............................................................................................143
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