ATmega32U2 datasheet(310/314 Pages) ATMEL

310 / 314 page

7799B–AVR–07/09

ATmega8U2/16U2/32U2

18.2Overview ..............................................................................................................148

18.3Clock Generation .................................................................................................149

18.4Frame Formats ....................................................................................................152

18.5USART Initialization .............................................................................................154

18.6Data Transmission – The USART Transmitter ....................................................155

18.7Data Reception – The USART Receiver .............................................................157

18.8Asynchronous Data Reception ............................................................................161

18.9Multi-processor Communication Mode ................................................................164

18.10Hardware Flow Control ......................................................................................165

18.11Register Description ..........................................................................................167

18.12Examples of Baud Rate Setting .........................................................................171

USART in SPI Mode ............................................................................. 176

19.1Features ..............................................................................................................176

19.2Overview ..............................................................................................................176

19.3Clock Generation .................................................................................................176

19.4SPI Data Modes and Timing ................................................................................177

19.5Frame Formats ....................................................................................................178

19.6Data Transfer .......................................................................................................179

19.7Register Description ............................................................................................181

19.8AVR USART MSPIM vs. AVR SPI ......................................................................183

USB Controller ..................................................................................... 185

20.1Features ..............................................................................................................185

20.2Overview ..............................................................................................................185

20.3USB Module Powering Options ...........................................................................186

20.4General Operating Modes ...................................................................................189

20.5Power modes .......................................................................................................191

20.6Memory management ..........................................................................................192

20.7PAD suspend .......................................................................................................193

20.8D+/D- Read/write .................................................................................................194

20.9USB Software Operating modes .........................................................................194

20.10Registers Description ........................................................................................195

USB Device Operating modes ............................................................ 197

21.1Overview ..............................................................................................................197

21.2Power-on and reset .............................................................................................197

21.3Endpoint reset .....................................................................................................197

ATmega32U2 Datasheet(PDF) 310 Page - ATMEL Corporation