AT90USB646 datasheet(281/456 Pages) ATMEL

281 / 456 page

281

7593L–AVR–09/12

AT90USB64/128

• 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

Set by hardware when a NAK handshake has been sent in response of a IN request from the

host. This triggers an USB interrupt if NAKINE is sent.

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

• 5 - RWAL - Read/Write Allowed flag

Set by hardware to signal:

- for an IN endpoint: the current bank is not full, that is, the firmware can push data into the FIFO,

- for an OUT endpoint: the current bank is not empty, that is, the firmware can read data from the

FIFO.

The bit is never set if STALLRQ is set, or in case of error.

Cleared by hardware otherwise.

This bit shall not be used for the control endpoint.

Bit

43210

FIFOCON

NAKINI

RWAL

NAKOUTI

RXSTPI

RXOUTI

STALLEDI

TXINI

UEINTX

Read/write

R/W

Initial value

00000

AT90USB646 Datasheet(PDF) 281 Page - ATMEL Corporation

AT90USB646 Datasheet(HTML) 281 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL