AT90USB646 datasheet(265/435 Pages) ATMEL

265 / 435 page

265

7593D–AVR–07/06

AT90USB64/128

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.

• 3 – SRPSEL: SRP Selection Bit

Set to choose VBUS pulsing as SRP method.

Clear to choose data line pulsing as SRP method.

• 2 – VBUSHWC: VBus Hardware Control Bit

Set to disable the hardware control over the UVCON pin.

Clear to enable the hardware control over the UVCON pin.

See for more details

• 1 – VBUSREQ: VBUS Request Bit

Set to assert the UVCON pin in order to enable the VBUS power supply generation. This bit

shall be used when the controller is in the Host mode.

Cleared by hardware when VBUSRQC is set.

• 0 – VBUSRQC: VBUS Request Clear Bit

Initial Value

00000000

Bit

HNPREQ

SRPREQ

SRPSEL

VBUSHWC

VBUSREQ

VBUSRQC

OTGCON

Read/Write

R/W

Initial Value

Bit

76543210

AT90USB646 Datasheet(PDF) 265 Page - ATMEL Corporation

AT90USB646 Datasheet(HTML) 265 Page - ATMEL Corporation

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