AT90USB646 datasheet(259/456 Pages) ATMEL

259 / 456 page

259

7593L–AVR–09/12

AT90USB64/128

• 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

Set to deassert 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 immediately after the set.

• 7 – Reserved

This bit is reserved and always set.

• 6-5 – PAGE: Timer page access bit

Set/clear to access a special timer register. See Section 22.9, page 254 for more details.

• 4-3 - Reserved

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

• 1-0 – VALUE: Value bit

Set to initialize the new value of the timer. See Section 22.9, page 254 for more details.

Bit

PAGE

VALUE

OTGTCON

Read/write

R/W

Initial value

AT90USB646 Datasheet(PDF) 259 Page - ATMEL Corporation