AT90USB646 datasheet(258/456 Pages) ATMEL

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258

7593L–AVR–09/12

AT90USB64/128

• 3 – SPEED: Speed Status Flag

This should be read only when the USB controller operates in host mode, in device mode the

value read from this bit is undeterminated.

Set by hardware when the controller is in FULL-SPEED mode. Cleared by hardware when the

controller is in LOW-SPEED mode.

• 2 – Reserved

The value read from this bit is always 0. Do not set this bit.

• 1 – ID: IUD pin flag

The value read from this bit indicates the state of the UID pin.

• 0 – VBUS: VBus flag

The value read from this bit indicates the state of the VBUS pin. This bit can be used in device

mode to monitor the USB bus connection state of the application. See Section 22.10, page 255

for more details.

7-2 - Reserved

The value read from these bits is always 0. Do not set these bits.

1 – IDTI: D Transition Interrupt flag

Set by hardware when a transition (high to low, low to high) has been detected on the UID pin.

Shall be cleared by software.

• 0 – VBUSTI: IVBUS Transition Interrupt flag

Set by hardware when a transition (high to low, low to high) has been detected on the VBUS

pad.

Shall be cleared by software.

• 7-6 - Reserved

The value read from these bits is always 0. Do not set these bits.

• 5 – HNPREQ: HNP Request bit

Set to initiate the HNP when the controller is in the Device mode (B). Set to accept the HNP

when the controller is in the Host mode (A).

Clear otherwise.

Bit

76543210

------

IDTI

VBUSTI

USBINT

Read/write

RRRRRR

R/W

Initial value

00000000

Bit

HNPREQ

SRPREQ

SRPSEL

VBUSHWC

VBUSREQ

VBUSRQC

OTGCON

Read/write

R/W

Initial value

AT90USB646 Datasheet(PDF) 258 Page - ATMEL Corporation

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