AT90USB646 datasheet(262/459 Pages) ATMEL

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7593H–AVR–11/08

ATmega32U6/AT90USB64/128

• 0 – UVREGE: USB pad regulator Enable

Set to enable the USB pad regulator. Clear to disable the USB pad regulator.

• 7 – USBE: USB macro Enable Bit

Set to enable the USB controller. Clear to disable and reset the USB controller, to disable the

USB transceiver and to disable the USB controller clock inputs.

• 6 – HOST: HOST Bit

Set to enable the Host mode. Clear to enable the device mode.

• 5 – FRZCLK: Freeze USB Clock Bit

Set to disable the clock inputs (the ”Resume Detection” is still active). This reduces the power

consumption. Clear to enable the clock inputs.

• 4 – OTGPADE: OTG Pad Enable

Set to enable the OTG pad. Clear to disable the OTG pad. The OTG pad is actually the VBUS

pad.

Note that this bit can be set/cleared even if USBE=0. That allows the VBUS detection even if the

USB macro is disabled. This pad must be enabled in both Host and Device modes in order to

allow USB operation (attaching, transmitting...).

• 3-2 – Reserved

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

• 1 – IDTE: ID Transition Interrupt Enable Bit

Set this bit to enable the ID Transition interrupt generation. Clear this bit to disable the ID Transi-

tion interrupt generation.

• 0 – VBUSTE: VBUS Transition Interrupt Enable Bit

Set this bit to enable the VBUS Transition interrupt generation.

Clear this bit to disable the VBUS Transition interrupt generation.

• 7-4 - Reserved

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

• 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.

Bit

321

USBE

HOST

FRZCLK

OTGPADE

IDTE

VBUSTE

USBCON

Read/Write

R/W

Initial Value

Bit

SPEED

VBUS

USBSTA

Read/Write

Initial Value

AT90USB646 Datasheet(PDF) 262 Page - ATMEL Corporation

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