AT90PWM2/3/2B/3B
16.26 PSC2 Specific Register 170
17 Serial Peripheral Interface – SPI 173
17.1
17.2
17.3
Features 173
SS Pin Functionality 177
Data Modes 181
18 USART 183
18.1
18.2
18.3
18.4
18.5
18.6
18.7
18.8
18.9
Features 183
Overview 183
Clock Generation 184
Serial Frame 187
USART Initialization 188
Data Transmission – USART Transmitter 189
Data Reception – USART Receiver 192
Asynchronous Data Reception 197
Multi-processor Communication Mode 200
18.10 USART Register Description 201
18.11 Examples of Baud Rate Setting 206
19 EUSART (Extended USART) 210
19.1
19.2
19.3
19.4
19.5
19.6
Features 210
Overview 210
Serial Frames 211
Configuring the EUSART 217
Data Reception – EUSART Receiver 218
EUSART Registers Description 220
20 Analog Comparator 226
20.1
20.2
Overview 226
Analog Comparator Register Description 227
21 Analog to Digital Converter - ADC 233
21.1
21.2
21.3
21.4
21.5
21.6
Features 233
Operation 235
Starting a Conversion 235
Prescaling and Conversion Timing 236
Changing Channel or Reference Selection 238
ADC Noise Canceler 240
iv
4317J–AVR–08/10
ATMEL [ ATMEL ]
