Atmel ATtiny25

193
7598H–AVR–07/09
ATtiny25/45/85
12.3 Counter Unit ....................................................................................................62
12.4 Output Compare Unit .......................................................................................63
12.5 Compare Match Output Unit ............................................................................65
12.6 Modes of Operation .........................................................................................66
12.7 Timer/Counter Timing Diagrams .....................................................................70
12.8 8-bit Timer/Counter Register Description ........................................................72
13 Timer/Counter Prescaler ....................................................................... 78
13.1 Prescaler Reset ...............................................................................................78
13.2 External Clock Source .....................................................................................79
14 Counter and Compare Units ................................................................. 81
14.1 Timer/Counter1 ................................................................................................81
15 Dead Time Generator ............................................................................. 93
15.1 Timer/Counter1 Dead Time Prescaler register 1 - DTPS1 ..............................94
15.2 Timer/Counter1 Dead Time A - DT1A .............................................................95
15.3 Timer/Counter1 Dead Time B - DT1B .............................................................95
16 Universal Serial Interface – USI ............................................................ 96
16.1 Overview ..........................................................................................................96
16.2 Functional Descriptions ...................................................................................97
16.3 Alternative USI Usage ...................................................................................103
16.4 USI Register Descriptions .............................................................................103
17 Analog Comparator ............................................................................. 108
17.1 ADC Control and Status Register B – ADCSRB ...........................................108
17.2 Analog Comparator Control and Status Register – ACSR ............................108
17.3 Analog Comparator Multiplexed Input ...........................................................110
18 Analog to Digital Converter ................................................................ 111
18.1 Features ........................................................................................................111
18.2 Operation .......................................................................................................112
18.3 Starting a Conversion ....................................................................................113
18.4 Prescaling and Conversion Timing ................................................................114
18.5 Changing Channel or Reference Selection ...................................................117
18.6 ADC Noise Canceler .....................................................................................118
18.7 ADC Conversion Result .................................................................................121
19 debugWIRE On-chip Debug System .................................................. 128
19.1 Features ........................................................................................................128