Datasheet
3
2490R–AVR–02/2013
ATmega64(L)
16-bit Timer/Counter Register Description 132
Timer/Counter3, Timer/Counter2 and Timer/Counter1 Prescalers 144
8-bit Timer/Counter2 with PWM 146
Overview 146
Timer/Counter Clock Sources 147
Counter Unit 148
Output Compare Unit 148
Compare Match Output Unit 150
Modes of Operation 151
Timer/Counter Timing Diagrams 155
8-bit Timer/Counter Register Description 157
Output Compare Modulator (OCM1C2) 161
Overview 161
Description 161
SPI – Serial Peripheral Interface 163
SS Pin Functionality 167
Data Modes 170
USART 171
Overview 171
Clock Generation 172
Frame Formats 175
USART Initialization 176
Data Transmission – The USART Transmitter 178
Data Reception – The USART Receiver 181
Asynchronous Data Reception 184
Multi-processor Communication Mode 187
USART Register Description 188
Examples of Baud Rate Setting 193
TWI – Two-wire Serial Interface 198
Features 198
Two-wire Serial Interface Bus Definition 198
Data Transfer and Frame Format 199
Multi-master Bus Systems, Arbitration and Synchronization 202
Overview of the TWI Module 204
TWI Register Description 206
Using the TWI 209
Transmission Modes 212
Multi-master Systems and Arbitration 225
Analog Comparator 227