AT90USB82 datasheet(212/306 Pages) ATMEL

212 / 306 page

212

7707D–AVR–07/08

AT90USB82/162

• 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.

• 3-0 - Reserved

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

20.18.2

USB device endpoint registers

• 7-3 - Reserved

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

• 2-0 - EPNUM2:0 Endpoint Number Bits

Set to select the number of the endpoint which shall be accessed by the CPU. See Section 20.5,

page 197 for more details.

Values greater than 100b are forbidden.

• 7-5 - Reserved

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

• 4-0 - EPRST4:0 - Endpoint FIFO Reset Bits

Set to reset the selected endpoint FIFO prior to any other operation, upon hardware reset or

when an USB bus reset has been received. See Section 20.3, page 196 for more information

Bit

654

3210

--FNCERR

----

UDMFN

Read/Wri

RRR/W

RRRR

Initial

Value

000

0000

Bit

654

3210

EPNUM2:0

UENUM

Read/Wri

RRR

RR/W

R/W

Initial

Value

000

0000

Bit

654

3210

EPRST D4

EPRST D3

EPRST D2

EPRST D1

EPRST D0

UERST

Read/Wri

R/W

Initial

Value

000

0000

AT90USB82 Datasheet(PDF) 212 Page - ATMEL Corporation

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