Datasheet

iv
8021G–AVR–03/11
ATmega329P/3290P
17.10Register Description ..........................................................................................155
18 SPI – Serial Peripheral Interface ......................................................... 160
18.1Features ..............................................................................................................160
18.2Overview .............................................................................................................160
18.3SS
Pin Functionality ............................................................................................165
18.4Data Modes .........................................................................................................165
18.5Register Description ............................................................................................167
19 USART0 ................................................................................................. 170
19.1Features ..............................................................................................................170
19.2Overview .............................................................................................................170
19.3Clock Generation .................................................................................................172
19.4Frame Formats ....................................................................................................175
19.5USART Initialization ............................................................................................176
19.6Data Transmission – The USART Transmitter ....................................................178
19.7Data Reception – The USART Receiver .............................................................180
19.8Asynchronous Data Reception ............................................................................184
19.9Multi-processor Communication Mode ................................................................187
19.10Register Description ..........................................................................................189
19.11Examples of Baud Rate Setting ........................................................................193
20 USI – Universal Serial Interface .......................................................... 198
20.1Features ..............................................................................................................198
20.2Overview .............................................................................................................198
20.3Functional Descriptions .......................................................................................199
20.4Alternative USI Usage .........................................................................................205
20.5Register Description ............................................................................................206
21 Analog Comparator ............................................................................. 210
21.1Overview .............................................................................................................210
21.2Analog Comparator Multiplexed Input .................................................................210
21.3Register Description ............................................................................................211
22 Analog to Digital Converter ................................................................ 213
22.1Features ..............................................................................................................213
22.2Overview .............................................................................................................213
22.3Operation .............................................................................................................214
22.4Starting a Conversion ..........................................................................................215