Datasheet

305

32133D–11/2011

UC3D

19.7.1.2 General Status Register

Access Type: Read-Only

Offset: 0x0804

Reset Value: 0x00000000

• CLKUSABLE: Generic Clock Usable

This bit is cleared when the USB generic clock is not usable.

This bit is set when the USB generic clock (that should be 48 Mhz) is usable.

• SPEED: Speed Status

This field is set according to the controller speed mode.

• VBUS: VBUS Level

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

This bit is set when the VBUS line level is high, even if USBE is zero.

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

• VBUSTI: VBUS Transition Interrupt

This bit is cleared when the USBSTACLR.VBUSTIC bit is written to one.

This bit is set when a transition (high to low, low to high) has been detected on the USB_VBUS pad. This triggers a USB

interrupt if VBUSTE is one.

This interrupt is generated even if the clock is frozen by the FRZCLK bit.

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 - - -

76543210

------VBUSTI-

SPEED Speed Status

00 full-speed mode

01 Reserved

10 low-speed mode

11 Reserved