Datasheet

ii
8197C–AVR–05/11
ATtiny261A/461A/861A
7.2 Software BOD Disable .....................................................................................36
7.3 Power Reduction Register ...............................................................................37
7.4 Minimizing Power Consumption ......................................................................37
7.5 Register Description ........................................................................................38
8 System Control and Reset .................................................................... 40
8.1 Resetting the AVR ...........................................................................................40
8.2 Reset Sources .................................................................................................41
8.3 Internal Voltage Reference ..............................................................................43
8.4 Watchdog Timer ..............................................................................................43
8.5 Register Description ........................................................................................46
9 Interrupts ................................................................................................ 49
9.1 Interrupt Vectors ..............................................................................................49
9.2 External Interrupts ...........................................................................................50
9.3 Register Description ........................................................................................51
10 I/O Ports .................................................................................................. 54
10.1 Ports as General Digital I/O .............................................................................55
10.2 Alternate Port Functions ..................................................................................59
10.3 Register Description ........................................................................................68
11 Timer/Counter0 ...................................................................................... 70
11.1 Features ..........................................................................................................70
11.2 Overview ..........................................................................................................70
11.3 Clock Sources .................................................................................................71
11.4 Counter Unit ....................................................................................................73
11.5 Input Capture Unit ...........................................................................................74
11.6 Output Compare Unit .......................................................................................75
11.7 Modes of Operation .........................................................................................76
11.8 Timer/Counter Timing Diagrams .....................................................................78
11.9 Accessing Registers in 16-bit Mode ................................................................79
11.10 Register Description ........................................................................................83
12 Timer/Counter1 ...................................................................................... 88
12.1 Features ..........................................................................................................88
12.2 Overview ..........................................................................................................88
12.3 Clock Sources .................................................................................................91
12.4 Counter Unit ....................................................................................................92