AT90USB646 datasheet(288/434 Pages) ATMEL

288 / 434 page

288

7593A–AVR–02/06

AT90USB64/128

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

1 busy bank

10b

2 busy banks

11b

Reserved.

• 7-3 - Reserved

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

• 2 - CTRLDIR - Control Direction (Flag, and bit for debug purpose)

Set by hardware after a SETUP packet, and gives the direction of the following packet:

- 1 for IN endpoint

- 0 for OUT endpoint.

Can not be set or cleared by software.

• 1-0 - CURRBK1:0 - Current Bank (all endpoints except Control endpoint) Flag

Set by hardware to indicate the number of the current bank:

00b

Bank0

01b

Bank1

1xb

Reserved.

Can not be set or cleared by software.

• 7 - FIFOCON - FIFO Control Bit

For OUT and SETUP Endpoint:

Bit

CTRLDIR

CURRBK1:0

UESTA1X

Read/Write

Initial Value

Bit

43210

FIFOCON

NAKINI

RWAL

NAKOUTI

RXSTPI

RXOUTI

STALLEDI

TXINI

UEINTX

Read/Write

R/W

Initial Value

00000

AT90USB646 Datasheet(PDF) 288 Page - ATMEL Corporation

AT90USB646 Datasheet(HTML) 288 Page - ATMEL Corporation

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