Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD Data Sheet

32072H–AVR32–10/2012

USBSTA

Read-Only

0x0804

0x00000400

This bit is set when the UTMI 30MHz is usable.

This bit is cleared when the UTMI 30MHz is not usable.

This field is set according to the controller speed mode..

This bit is set when the VBus line level is high.

This bit is cleared when the VBus line level is low.

This bit can be used in either device or host mode to monitor the USB bus connection state of the application.

This bit is cleared when the USB_ID level is low, even if USBE is zero.

This bit is set when the USB_ID level is high, event if USBE is zero.

This bit is set when the USBSTASET.VBUSRQS bit is written to one.

This bit is cleared when the USBSTACLR.VBUSRQC bit is written to one or when a VBus error occurs and VBUSHWC is zero.

1: The USB_VBOF output pin is driven high to enable the VBUS power supply generation.

0: The USB_VBOF output pin is driven low to disable the VBUS power supply generation.

This bit shall only be used in host mode.

31

30

29

28

27

26

25

24

-

-

-

-

-

-

-

-

23

22

21

20

19

18

17

16

-

-

-

-

-

-

-

-

15

14

13

12

11

10

9

8

-

CLKUSABLE

SPEED

VBUS

ID

VBUSRQ

-

7

6

5

4

3

2

1

0

STOI

ROLEEXI

BCERRI

VBERRI

VBUSTI

IDTI

0

0

Full-Speed mode

1

0

Low-Speed mode

0

1

High-Speed mode

1

1

Reserved