Datasheet

iii
8023F–AVR–07/09
ATmega325P/3250P
13.2Ports as General Digital I/O ...................................................................................64
13.3Alternate Port Functions ........................................................................................69
13.4Register Description ..............................................................................................85
14 8-bit Timer/Counter0 with PWM ............................................................ 89
14.1Features ................................................................................................................89
14.2Overview ...............................................................................................................89
14.3Timer/Counter Clock Sources ...............................................................................90
14.4Counter Unit ..........................................................................................................90
14.5Output Compare Unit ............................................................................................92
14.6Compare Match Output Unit ..................................................................................93
14.7Modes of Operation ...............................................................................................94
14.8Timer/Counter Timing Diagrams ...........................................................................99
14.9Timer/Counter0 and Timer/Counter1 Prescalers .................................................100
14.10Register Description ..........................................................................................102
15 16-bit Timer/Counter1 .......................................................................... 107
15.1Features ..............................................................................................................107
15.2Overview .............................................................................................................107
15.3Accessing 16-bit Registers ..................................................................................110
15.4Timer/Counter Clock Sources .............................................................................112
15.5Counter Unit ........................................................................................................113
15.6Input Capture Unit ...............................................................................................114
15.7Output Compare Units .........................................................................................116
15.8Compare Match Output Unit ................................................................................117
15.9Modes of Operation .............................................................................................119
15.10Timer/Counter Timing Diagrams .......................................................................126
15.11Register Description ..........................................................................................128
16 8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 135
16.1Features ..............................................................................................................135
16.2Overview .............................................................................................................135
16.3Timer/Counter Clock Sources .............................................................................136
16.4Counter Unit ........................................................................................................137
16.5Output Compare Unit ..........................................................................................137
16.6Compare Match Output Unit ................................................................................139
16.7Modes of Operation .............................................................................................140
16.8Timer/Counter Timing Diagrams .........................................................................145