AT90USB646 datasheet(280/456 Pages) ATMEL

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280

7593L–AVR–09/12

AT90USB64/128

• 6 - OVERFI - Overflow Error Interrupt flag

Set by hardware when an overflow error occurs in an isochronous endpoint. An interrupt

(EPINTx) is triggered (if enabled).

See Section 23.15, page 271 for more details.

Shall be cleared by software. Setting by software has no effect.

• 5 - UNDERFI - Flow Error Interrupt flag

Set by hardware when an underflow error occurs in an isochronous endpoint. An interrupt

(EPINTx) is triggered (if enabled).

See Section 23.15, page 271 for more details.

Shall be cleared by software. Setting by software has no effect.

• 4 - Reserved

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

• 3-2 - DTSEQ1:0 - Data Toggle Sequencing flag

Set by hardware to indicate the PID data of the current bank:

00b

Data0

01b

Data1

1xb

Reserved

For OUT transfer, this value indicates the last data toggle received on the current bank.

For IN transfer, it indicates the Toggle that will be used for the next packet to be sent. This is not

relative to the current bank.

• 1-0 - NBUSYBK1:0 - Busy Bank flag

Set by hardware to indicate the number of busy bank.

For IN endpoint, it indicates the number of busy bank(s), filled by the user, ready for IN transfer.

For OUT endpoint, it indicates the number of busy bank(s) filled by OUT transaction from the

host.

00b

All banks are free

01b

One busy bank

10b

Two busy banks

11b

Reserved

• 7-3 - Reserved

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

Bit

CTRLDIR

CURRBK1:0

UESTA1X

Read/write

Initial value

AT90USB646 Datasheet(PDF) 280 Page - ATMEL Corporation

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