AT90USB646 datasheet(263/459 Pages) ATMEL

263 / 459 page

263

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

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 appication. See Section 21.10, page 259

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.

• 4 – SRPREQ: SRP Request Bit

Set to initiate the SRP when the controller is in Device mode. Cleared by hardware when the

controller is initiating a SRP.

Bit

IDTI

VBUSTI

USBINT

Read/Write

R/W

Initial Value

Bit

HNPREQ

SRPREQ

SRPSEL

VBUSHWC

VBUSREQ

VBUSRQC

OTGCON

Read/Write

R/W

Initial Value

AT90USB646 Datasheet(PDF) 263 Page - ATMEL Corporation

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