Datasheet

iv
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
17.5Output Compare unit ...........................................................................................145
17.6Compare Match Output unit ................................................................................147
17.7Modes of operation ..............................................................................................148
17.8Timer/Counter Timing diagrams ..........................................................................152
17.9Asynchronous Operation of Timer/Counter2 .......................................................154
17.10Timer/Counter Prescaler ...................................................................................156
17.11Register description ...........................................................................................157
18 SPI – Serial Peripheral Interface ......................................................... 165
18.1Features ..............................................................................................................165
18.2Overview .............................................................................................................165
18.3SS
pin functionality ..............................................................................................170
18.4Data modes .........................................................................................................170
18.5Register description .............................................................................................172
19 USART ................................................................................................... 175
19.1Features ..............................................................................................................175
19.2USART1 and USART0 ........................................................................................175
19.3Overview .............................................................................................................175
19.4Clock Generation .................................................................................................176
19.5Frame formats .....................................................................................................179
19.6USART Initialization ............................................................................................180
19.7Data Transmission – The USART Transmitter ....................................................181
19.8Data Reception – The USART Receiver .............................................................184
19.9Asynchronous Data Reception ............................................................................188
19.10Multi-processor Communication mode ..............................................................191
19.11Register description ...........................................................................................193
19.12Examples of Baud Rate Setting ........................................................................198
20 USART in SPI mode ............................................................................. 202
20.1Features ..............................................................................................................202
20.2Overview .............................................................................................................202
20.3Clock Generation .................................................................................................202
20.4SPI Data Modes and Timing ...............................................................................203
20.5Frame Formats ....................................................................................................203
20.6Data Transfer ......................................................................................................205
20.7AVR USART MSPIM vs. AVR SPI ......................................................................207
20.8Register description .............................................................................................208