
ii
8127B–AVR–08/09
7.3 Minimizing Power Consumption ......................................................................24
7.4 Register Description ........................................................................................25
8 System Control and Reset .................................................................... 27
8.1 Resetting the AVR ...........................................................................................27
8.2 Reset Sources .................................................................................................27
8.3 Watchdog Timer ..............................................................................................30
8.4 Register Description ........................................................................................32
9 Interrupts ................................................................................................ 35
9.1 Interrupt Vectors ..............................................................................................35
9.2 External Interrupts ...........................................................................................36
9.3 Register Description ........................................................................................37
10 I/O Ports .................................................................................................. 40
10.1 Overview ..........................................................................................................40
10.2 Ports as General Digital I/O .............................................................................41
10.3 Alternate Port Functions ..................................................................................45
10.4 Register Description ........................................................................................50
11 16-bit Timer/Counter0 ............................................................................ 52
11.1 Features ..........................................................................................................52
11.2 Overview ..........................................................................................................52
11.3 Clock Sources .................................................................................................54
11.4 Counter Unit ....................................................................................................55
11.5 Input Capture Unit ...........................................................................................57
11.6 Output Compare Units .....................................................................................59
11.7 Compare Match Output Unit ............................................................................61
11.8 Modes of Operation .........................................................................................62
11.9 Timer/Counter Timing Diagrams .....................................................................69
11.10 Accessing 16-bit Registers ..............................................................................71
11.11 Register Description ........................................................................................73
12 Analog Comparator ............................................................................... 81
12.1 Register Description ........................................................................................81
13 Analog to Digital Converter .................................................................. 83
13.1 Features ..........................................................................................................83
13.2 Overview ..........................................................................................................83
13.3 Operation .........................................................................................................83
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