Datasheet

iv
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
16.23 PSC Clock Sources 161
16.24 Interrupts 162
16.25 PSC Register Definition 163
16.26 PSC2 Specific Register 172
17 Serial Peripheral Interface – SPI 175
17.1 Features 175
17.2 SS
Pin Functionality 179
17.3 Data Modes 183
18 USART 185
18.1 Features 185
18.2 Overview 185
18.3 Clock Generation 186
18.4 Serial Frame 189
18.5 USART Initialization 190
18.6 Data Transmission – USART Transmitter 191
18.7 Data Reception – USART Receiver 194
18.8 Asynchronous Data Reception 199
18.9 Multi-processor Communication Mode 202
18.10 USART Register Description 203
18.11 Examples of Baud Rate Setting 208
19 EUSART (Extended USART) 212
19.1 Features 212
19.2 Overview 212
19.3 Serial Frames 213
19.4 Configuring the EUSART 218
19.5 Data Reception – EUSART Receiver 219
19.6 EUSART Registers Description 221
20 Analog Comparator 227
20.1 Overview 227
20.2 Analog Comparator Register Description 228
21 Analog to Digital Converter - ADC 234
21.1 Features 234
21.2 Operation 236
21.3 Starting a Conversion 236