AT90USB646 datasheet(276/456 Pages) ATMEL

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276

7593L–AVR–09/12

AT90USB64/128

• 1 - Reserved

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

• 0 - SUSPE - Suspend Interrupt Enable Bit

Set to enable the SUSPI interrupt.

Clear to disable the SUSPI interrupt.

• 7 - ADDEN - Address Enable Bit

Set to activate the UADD (USB address).

Cleared by hardware. Clearing by software has no effect.

See Section 23.7, page 264 for more details.

• 6-0 - UADD6:0 - USB Address Bits

Load by software to configure the device address.

• 7-3 - Reserved

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

• 2-0 - FNUM10:8 - Frame Number Upper Value

Set by hardware. These bits are the three MSB of the 11-bits Frame Number information. They

are provided in the last received SOF packet. FNUM is updated if a corrupted SOF is received.

• Frame Number Lower Value

Set by hardware. These bits are the eight LSB of the 11-bits Frame Number information.

• 7-5 - Reserved

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

• 4 - FNCERR -Frame Number CRC Error flag

Set by hardware when a corrupted Frame Number in start of frame packet is received.

This bit and the SOFI interrupt are updated at the same time.

Bit

65432

ADDEN

UADD6:0

UDADDR

Read/write

R/W

Initial value

00000

Bit

76543

-----

FNUM10:8

UDFNUMH

Read/write

RRR

Initial value

00000

Bit

765432

FNUM7:0

UDFNUML

Read/write

RRRRRR

Initial value

000000

Bit

FNCERR

UDMFN

Read/write

Initial value

AT90USB646 Datasheet(PDF) 276 Page - ATMEL Corporation

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