AT90USB646 datasheet(287/434 Pages) ATMEL

287 / 434 page

287

7593A–AVR–02/06

AT90USB64/128

• 1 - ALLOC - Endpoint Allocation Bit

Set this bit to allocate the endpoint memory.

Clear to free the endpoint memory.

See Section 22.7, page 270 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.

• 6 - OVERFI - Overflow Error Interrupt Flag

Set by hardware when an overflow error occurs in an isochronous endpoint. An interrupt

(EPINTx) is triggered (if enabled).

See Section 22.16, page 278 for more details.

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

• 5 - UNDERFI - Flow Error Interrupt Flag

Set by hardware when an underflow error occurs in an isochronous endpoint. An interrupt

(EPINTx) is triggered (if enabled).

See Section 22.16, page 278 for more details.

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

• 4 - ZLPSEEN - Zero Length Packet Seen (bit / Flag)

Set by hardware, as soon as a ZLP has been filtered during a transfer.

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

• 3-2 - DTSEQ1:0 - Data Toggle Sequencing Flag

Set by hardware to indicate the PID data of the current bank:

00b

Data0

01b

Data1

1xb

Reserved.

For OUT transfer, this value indicates the last data toggle received on the current bank.

Bit

765

CFGOK

OVERFI

UNDERFI ZLPSEEN

DTSEQ1:0

NBUSYBK1:0

UESTA0X

Read/Write

R/W

Initial Value

AT90USB646 Datasheet(PDF) 287 Page - ATMEL Corporation

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