AT90USB646 datasheet(279/456 Pages) ATMEL

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279

7593L–AVR–09/12

AT90USB64/128

• 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 23.6, page 263 for more details.

• 0 - Reserved

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

• 7 - CFGOK - Configuration Status flag

Set by hardware when the endpoint X size parameter (EPSIZE) and the bank parametrization

(EPBK) are correct compared to the max FIFO capacity and the max number of allowed bank.

This bit is updated when the bit ALLOC is set.

If this bit is cleared, the user should reprogram the UECFG1X register with correct EPSIZE and

EPBK values.

Bit

EPSIZE2:0

EPBK1:0

ALLOC

UECFG1X

Read/write

R/W

Initial value

Bit

765

CFGOK

OVERFI

UNDERFI

DTSEQ1:0

NBUSYBK1:0

UESTA0X

Read/write

R/W

Initial value

AT90USB646 Datasheet(PDF) 279 Page - ATMEL Corporation

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