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AVR32768

32157A-AVR-12/10

15 Table of Contents

Features ............................................................................................... 1

1 Introduction ...................................................................................... 1

2 Abbreviations ................................................................................... 2

3 References........................................................................................ 2

3.1 Device datasheet................................................................................................. 2

3.2 The AVR Software Framework............................................................................ 2

3.3 The AT32UC3C-EK Getting Started ................................................................... 2

3.4 USB DFU boot loader.......................................................................................... 2

4 Power circuit .................................................................................... 3

4.1 Single 3.3V power supply.................................................................................... 3

4.2 Single 5V power supply....................................................................................... 5

5 Reset circuit ..................................................................................... 7

6 Clocks and crystal oscillators ........................................................ 8

6.1 External clock source .......................................................................................... 8

6.2 Crystal oscillator .................................................................................................. 8

7 ADC Analog-to-digital converter .................................................... 9

7.1 ADC analog Input ................................................................................................ 9

7.2 ADC voltage reference ........................................................................................ 9

7.2.1 ADC single-ended external reference (ADCREF0/ADCREF1).................................. 9

7.2.2 ADC differential external reference pins (ADCVREFP/ADCVREFN) ...................... 10

8 Digital-to-analog converter ........................................................... 12

8.1 DAC connection................................................................................................. 12

9 USB connection ............................................................................. 13

9.1 Not used ............................................................................................................ 13

9.2 Device mode, bus-powered connection ............................................................ 13

9.3 Device mode, self-powered connection ............................................................ 14

9.4 Host mode, powered from bus connection........................................................ 15

9.5 USB DFU ISP entry point .................................................................................. 15

10 Ethernet interface ........................................................................ 16

10.1 Ethernet interface in MII mode ........................................................................ 16

10.2 Ethernet interface in RMII mode...................................................................... 17

10.3 Ethernet Wake-on-LAN ................................................................................... 18

11 External bus interface ................................................................. 19