ATmega32U2 datasheet(309/314 Pages) ATMEL

309 / 314 page

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7799B–AVR–07/09

ATmega8U2/16U2/32U2

14.1Overview ................................................................................................................88

14.2Internal Clock Source ............................................................................................88

14.3Prescaler Reset .....................................................................................................88

14.4External Clock Source ...........................................................................................88

14.5Register Description ..............................................................................................89

8-bit Timer/Counter0 with PWM ............................................................ 91

15.1Features ................................................................................................................91

15.2Overview ................................................................................................................91

15.3Timer/Counter Clock Sources ...............................................................................92

15.4Counter Unit ..........................................................................................................92

15.5Output Compare Unit .............................................................................................93

15.6Compare Match Output Unit ..................................................................................95

15.7Modes of Operation ...............................................................................................96

15.8Timer/Counter Timing Diagrams .........................................................................100

15.9Register Description ............................................................................................102

16-bit Timer/Counter 1 with PWM ....................................................... 108

16.1Features ..............................................................................................................108

16.2Overview ..............................................................................................................108

16.3Accessing 16-bit Registers ..................................................................................110

16.4Timer/Counter Clock Sources .............................................................................113

16.5Counter Unit ........................................................................................................114

16.6Input Capture Unit ...............................................................................................115

16.7Output Compare Units .........................................................................................117

16.8Compare Match Output Unit ................................................................................119

16.9Modes of Operation .............................................................................................120

16.10Timer/Counter Timing Diagrams .......................................................................127

16.11Register Description ..........................................................................................129

SPI – Serial Peripheral Interface ......................................................... 138

17.1Features ..............................................................................................................138

17.2Overview ..............................................................................................................138

17.3SS Pin Functionality ............................................................................................142

17.4Data Modes .........................................................................................................143

17.5Register Description ............................................................................................145

USART ................................................................................................... 148

18.1Features ..............................................................................................................148

ATmega32U2 Datasheet(PDF) 309 Page - ATMEL Corporation