Datasheet

iv
8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
18.1Features ..............................................................................................................147
18.2Overview .............................................................................................................147
18.3Timer/Counter Clock Sources .............................................................................148
18.4Counter Unit ........................................................................................................149
18.5Output Compare Unit ..........................................................................................149
18.6Compare Match Output Unit ................................................................................151
18.7Modes of Operation .............................................................................................152
18.8Timer/Counter Timing Diagrams .........................................................................156
18.9Asynchronous Operation of Timer/Counter2 .......................................................158
18.10Register Description ..........................................................................................161
19 SPI – Serial Peripheral Interface ......................................................... 166
19.1Features ..............................................................................................................166
19.2Overview .............................................................................................................166
19.3SS
Pin Functionality ............................................................................................171
19.4Data Modes .........................................................................................................171
19.5Register Description ............................................................................................173
20 USART0 ................................................................................................. 176
20.1Features ..............................................................................................................176
20.2Overview .............................................................................................................176
20.3Clock Generation .................................................................................................178
20.4Frame Formats ....................................................................................................181
20.5USART Initialization ............................................................................................182
20.6Data Transmission – The USART Transmitter ....................................................184
20.7Data Reception – The USART Receiver .............................................................186
20.8Asynchronous Data Reception ............................................................................190
20.9Multi-processor Communication Mode ................................................................193
20.10Examples of Baud Rate Setting ........................................................................195
20.11Register Description ..........................................................................................199
21 USI – Universal Serial Interface .......................................................... 204
21.1Features ..............................................................................................................204
21.2Overview .............................................................................................................204
21.3Functional Descriptions .......................................................................................205
21.4Alternative USI Usage .........................................................................................211
21.5Register Description ............................................................................................212
22 Analog Comparator ............................................................................. 216