Datasheet

ii
7734Q–AVR–02/12
AT90PWM81/161
6.6 Power Reduction Register ...............................................................................46
6.7 Minimizing Power Consumption ......................................................................47
6.8 Register description .........................................................................................48
7 System Control and Reset .................................................................... 50
7.1 System Control overview .................................................................................50
7.2 System Control registers .................................................................................54
7.3 Internal Voltage Reference ..............................................................................55
7.4 Watchdog Timer ..............................................................................................56
8 Interrupts ................................................................................................ 62
8.1 Interrupt Vectors in AT90PWM81/161 .............................................................62
9 I/O-Ports .................................................................................................. 68
9.1 Introduction ......................................................................................................68
9.2 Ports as General Digital I/O .............................................................................69
9.3 Alternate Port Functions ..................................................................................73
9.4 Register Description for I/O-Ports ....................................................................81
10 External Interrupts ................................................................................. 83
11 Reduced 16-bit Timer/Counter1 ........................................................... 85
11.1 Overview ..........................................................................................................85
11.2 Accessing 16-bit Registers ..............................................................................87
11.3 Timer/Counter Clock Sources .........................................................................90
11.4 Counter Unit ....................................................................................................91
11.5 Input Capture Unit ...........................................................................................92
11.6 Modes of Operation .........................................................................................94
11.7 Timer/Counter Timing Diagrams .....................................................................95
11.8 16-bit Timer/Counter Register Description ......................................................97
12 Power Stage Controller – (PSCn) ....................................................... 100
12.1 Features ........................................................................................................100
12.2 Overview ........................................................................................................100
12.3 PSC Description ............................................................................................101
12.4 Signal Description ..........................................................................................103
12.5 Functional Description ...................................................................................104
12.6 Update of Values ...........................................................................................110
12.7 Enhanced Resolution ....................................................................................111
12.8 PSC Inputs ....................................................................................................114