AT90USB646 datasheet(286/459 Pages) ATMEL

286 / 459 page

286

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

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:

Set by hardware when a new OUT message is stored in the current bank, at the same time than

RXOUT or RXSTP.

Clear to free the current bank and to switch to the following bank. Setting by software has no

effect.

For IN Endpoint:

Set by hardware when the current bank is free, at the same time than TXIN.

Clear to send the FIFO data and to switch the bank. Setting by software has no effect.

• 6 - NAKINI - NAK IN Received Interrupt Flag

Bit

321

----

CTRLDIR

CURRBK1:0

UESTA1X

Read/Write

RRR

Initial Value

Bit

43210

FIFOCON

NAKINI

RWAL

NAKOUTI

RXSTPI

RXOUTI

STALLEDI

TXINI

UEINTX

Read/Write

R/W

Initial Value

00000

AT90USB646 Datasheet(PDF) 286 Page - ATMEL Corporation

AT90USB646 Datasheet(HTML) 286 Page - ATMEL Corporation

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