ATmega16U4 datasheet(403/408 Pages) ATMEL

403 / 408 page

403

7766D–AVR–01/09

ATmega16U4/ATmega32U4

16-bit Timers/Counters (Timer/Counter1 and Timer/Counter3) ....... 107

14.1 Overview .............................................................................................................107

14.2 Accessing 16-bit Registers .................................................................................109

14.3 Timer/Counter Clock Sources ............................................................................112

14.4 Counter Unit .......................................................................................................112

14.5 Input Capture Unit ..............................................................................................114

14.6 Output Compare Units ........................................................................................116

14.7 Compare Match Output Unit ...............................................................................117

14.8 Modes of Operation ............................................................................................119

14.9 Timer/Counter Timing Diagrams ........................................................................126

14.10 16-bit Timer/Counter Register Description .......................................................128

10-bit High Speed Timer/Counter4 ..................................................... 139

15.1 Features .............................................................................................................139

15.2 Overview .............................................................................................................139

15.3 Counter Unit .......................................................................................................143

15.4 Output Compare Unit ..........................................................................................144

15.5 Dead Time Generator .........................................................................................146

15.6 Compare Match Output Unit ...............................................................................147

15.7 Synchronous update ...........................................................................................150

15.8 Modes of Operation ............................................................................................150

15.9 Timer/Counter Timing Diagrams ........................................................................157

15.10 Fault Protection Unit .........................................................................................158

15.11 Accessing 10-Bit Registers ...............................................................................160

15.12 Register Description .........................................................................................163

Output Compare Modulator (OCM1C0A) ........................................... 176

16.1 Overview .............................................................................................................176

16.2 Description ..........................................................................................................176

Serial Peripheral Interface – SPI ......................................................... 178

17.1 SS Pin Functionality ...........................................................................................182

17.2 Data Modes ........................................................................................................185

USART ................................................................................................... 187

18.1 Overview .............................................................................................................187

18.2 Clock Generation ................................................................................................188

18.3 Frame Formats ...................................................................................................191

18.4 USART Initialization ............................................................................................193

ATmega16U4 Datasheet(PDF) 403 Page - ATMEL Corporation