Datasheet

iv
8018O–AVR–10/09
ATmega169P
17.9Timer/Counter Prescaler .....................................................................................152
17.108-bit Timer/Counter Register Description ..........................................................153
18 SPI – Serial Peripheral Interface ......................................................... 158
18.1Features ..............................................................................................................158
18.2Overview .............................................................................................................158
18.3SS
Pin Functionality ............................................................................................163
18.4Data Modes .........................................................................................................164
18.5Register Description ............................................................................................165
19 USART ................................................................................................... 168
19.1Features ..............................................................................................................168
19.2Overview .............................................................................................................168
19.3Clock Generation .................................................................................................170
19.4Frame Formats ....................................................................................................173
19.5USART Initialization ............................................................................................175
19.6Data Transmission – The USART Transmitter ....................................................177
19.7Data Reception – The USART Receiver .............................................................180
19.8Asynchronous Data Reception ............................................................................185
19.9Multi-processor Communication Mode ................................................................188
19.10Examples of Baud Rate Setting ........................................................................190
19.11USART Register Description .............................................................................194
20 USI – Universal Serial Interface .......................................................... 199
20.1Overview .............................................................................................................199
20.2Functional Descriptions .......................................................................................200
20.3Alternative USI Usage .........................................................................................206
20.4USI Register Descriptions ...................................................................................207
21 AC - Analog Comparator ..................................................................... 212
21.1Analog Comparator Multiplexed Input .................................................................213
21.2Analog Comparator Register Description ............................................................214
22 ADC - Analog to Digital Converter ..................................................... 216
22.1Features ..............................................................................................................216
22.2Overview .............................................................................................................216
22.3Operation .............................................................................................................217
22.4Starting a Conversion ..........................................................................................218
22.5Prescaling and Conversion Timing ......................................................................219