iii
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
13 External Interrupts ................................................................................. 72
13.1Pin Change Interrupt Timing .................................................................................72
13.2Register Description ..............................................................................................73
14 I/O-Ports .................................................................................................. 77
14.1Overview ...............................................................................................................77
14.2Ports as General Digital I/O ...................................................................................78
14.3Alternate Port Functions ........................................................................................82
14.4Register Description ..............................................................................................94
15 8-bit Timer/Counter0 with PWM ............................................................ 96
15.1Features ................................................................................................................96
15.2Overview ...............................................................................................................96
15.3Timer/Counter Clock Sources ...............................................................................98
15.4Counter Unit ..........................................................................................................98
15.5Output Compare Unit ............................................................................................99
15.6Compare Match Output Unit ................................................................................100
15.7Modes of Operation .............................................................................................101
15.8Timer/Counter Timing Diagrams .........................................................................106
15.9Register Description ............................................................................................108
16 16-bit Timer/Counter1 with PWM ........................................................ 115
16.1Features ..............................................................................................................115
16.2Overview .............................................................................................................115
16.3Accessing 16-bit Registers ..................................................................................117
16.4Timer/Counter Clock Sources .............................................................................120
16.5Counter Unit ........................................................................................................121
16.6Input Capture Unit ...............................................................................................122
16.7Output Compare Units .........................................................................................124
16.8Compare Match Output Unit ................................................................................126
16.9Modes of Operation .............................................................................................127
16.10Timer/Counter Timing Diagrams .......................................................................134
16.11Register Description ..........................................................................................136
17 Timer/Counter0 and Timer/Counter1 Prescalers .............................. 143
17.1Internal Clock Source ..........................................................................................143
17.2Prescaler Reset ...................................................................................................143
17.3External Clock Source .........................................................................................143
17.4Register Description ............................................................................................145
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