AT90USB646 datasheet(284/459 Pages) ATMEL

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284

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

00b: Control10b: Bulk

01b: Isochronous11b: Interrupt

• 5-4 - Reserved

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

• 3-2 - Reserved for test purpose

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

• 1 - Reserved

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

• 0 - EPDIR - Endpoint Direction Bit

Set to configure an IN direction for bulk, interrupt or isochronous endpoints.

Clear to configure an OUT direction for bulk, interrupt, isochronous or control endpoints.

• 7 - Reserved

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

• 6-4 - EPSIZE2:0 - Endpoint Size Bits

Set this bit according to the endpoint size:

000b: 8 bytes

100b: 128 bytes (only for endpoint 1)

001b: 16 bytes

101b: 256 bytes (only for endpoint 1)

010b: 32 bytes

110b: Reserved. Do not use this configuration.

011b: 64 bytes

111b: Reserved. Do not use this configuration.

• 3-2 - EPBK1:0 - Endpoint Bank Bits

Set this field according to the endpoint size:

00b: One bank

01b: Double bank

1xb: Reserved. Do not use this configuration.

• 1 - ALLOC - Endpoint Allocation Bit

Set this bit to allocate the endpoint memory.

Clear to free the endpoint memory.

See Section 22.6, page 268 for more details.

• 0 - Reserved

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

Bit

6543

EPSIZE2:0

EPBK1:0

ALLOC

UECFG1X

Read/Write

R/W

Initial Value

0000

AT90USB646 Datasheet(PDF) 284 Page - ATMEL Corporation

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