AT90USB646 datasheet(298/434 Pages) ATMEL

298 / 434 page

298

7593A–AVR–02/06

AT90USB64/128

If the OUT Pipe is composed of multiple banks, this also switches to the next data bank. The

TXOUT and FIFOCON bits are automatically updated by hardware regarding the status of the

next bank.

23.14 IN Pipe management

The Pipe must be configured first.

When the Host requires data from the device, the firmware has to determine first the IN mode to

use using the INMODE bit:

• INMODE = 0. The INRQX register is taken in account. The Host controller will perform

(INRQX+1) IN requests on the selected Pipe before freezing the Pipe. This mode avoids to

have extra IN requests on a Pipe.

• INMODE = 1. The USB controller will perform infinite IN request until the firmware freezes the

Pipe.

The IN request generation will start when the firmware clear the PFREEZE bit.

OUT

DATA

(bank 0)

ACK

TXOUT

FIFOCON

Example with 1 OUT data bank

write data from CPU

BANK 0

Example with 2 OUT data banks

OUT

DATA

(bank 0)

ACK

TXOUT

FIFOCON

write data from CPU

BANK 0

OUT

DATA

(bank 1)

ACK

write data from CPU

BANK 0

write data from CPU

BANK 1

write data from CPU

BANK0

Example with 2 OUT data banks

OUT

DATA

(bank 0)

ACK

TXOUT

FIFOCON

write data from CPU

BANK 0

write data from CPU

BANK 1

write data from CPU

BANK0

OUT

DATA

(bank 1)

ACK

AT90USB646 Datasheet(PDF) 298 Page - ATMEL Corporation

AT90USB646 Datasheet(HTML) 298 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