Datasheet

iii
7593L–AVR–09/12
AT90USB64X/128X
14.2 Timer/Counter clock sources ...............................................................................99
14.3 Counter unit .........................................................................................................99
14.4 Output compare unit ..........................................................................................100
14.5 Compare Match Output Unit ..............................................................................102
14.6 Modes of operation ............................................................................................103
14.7 Timer/Counter timing diagrams .........................................................................107
14.8 8-bit Timer/Counter register description ............................................................108
15 16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3) ........... 115
15.1 Overview ...........................................................................................................115
15.2 Accessing 16-bit registers .................................................................................117
15.3 Timer/Counter clock sources .............................................................................120
15.4 Counter unit .......................................................................................................121
15.5 Input Capture unit ..............................................................................................122
15.6 Output Compare units .......................................................................................124
15.7 Compare Match Output unit ..............................................................................126
15.8 Modes of operation ............................................................................................127
15.9 Timer/Counter timing diagrams .........................................................................134
15.10 16-bit Timer/Counter register description ........................................................136
16 8-bit Timer/Counter2 with PWM and asynchronous operation ........ 145
16.1 Overview ...........................................................................................................145
16.2 Timer/Counter clock sources .............................................................................146
16.3 Counter unit .......................................................................................................146
16.4 Output Compare unit .........................................................................................147
16.5 Compare Match Output unit ..............................................................................149
16.6 Modes of operation ............................................................................................150
16.7 Timer/Counter timing diagrams .........................................................................154
16.8 8-bit Timer/Counter register description ............................................................156
16.9 Asynchronous operation of the Timer/Counter ..................................................161
16.10 Timer/Counter prescaler ..................................................................................164
17 Output Compare Modulator (OCM1C0A) ........................................... 166
17.1 Overview ...........................................................................................................166
17.2 Description ........................................................................................................166
18 SPI – Serial Peripheral Interface ......................................................... 168
18.1 SS Pin Functionality ..........................................................................................172
18.2 Data modes .......................................................................................................175