2–9

2.4.6

OEPSIZXY_n: Output Endpoint X/Y Byte Count (n=1 to 3)

7

6

5

4

3

210

RSV

S6

S5

S4

S3

S2

S1

S0

R/O

R/W

R/W

R/W

R/W

R/W

R/W

R/W

BIT

NAME

RESET

FUNCTION

6–0

S[6:0]

x

X AND Y-Buffer size:

0000.0000b > Count = 0

0000.0001b > Count = 1 byte

:

:

0011.1111b > Count = 63 bytes

0100.0000b > Count = 64 bytes

Any value

≥ 100.0001b produces unpredictable results.

7

RSV

0

Reserved

2.4.7

IEPCNF_n: Input Endpoint Configuration (n=1 to 3)

7

6

5

4

3

210

UBME

ISO

TOGLE

DBUF

STALL

USBIE

RSV

RSV

R/W

R/W

R/W

R/W

R/W

R/W

R/O

R/O

BIT

NAME

RESET

FUNCTION

1–0

RSV

x

Reserved = 0

2

USBIE

x

USB interrupt enable on transaction completion.

USBIE = 0 No interrupt

USBIE = 1 Interrupt on transaction completion

3

STALL

0

USB stall condition indication. Set by UBM, but can be set/cleared by MCU.

STALL = 0

No stall

STALL = 1

USB stall condition. If set by MCU, a STALL handshake will be initiated and the bit is cleared

automaticallly.

4

DBUF

x

Double buffer enable

DBUF = 0

Primary buffer only (X–buffer only)

DBUF = 1

Toggle bit selects buffer

5

TOGLE

x

USB Toggle bit. This bit reflects the toggle sequence bit of DATA0, DATA1

6

ISO

x

ISO = 0

Non-isochronous transfer. This bit must be cleared by MCU since only Non-isochronous

transfer is supported.

7

UBME

x

UBM enable/disable bit. Set/clear by MCU.

UBME = 0 UBM cannot use this endpoint.

UBME = 1 UBM can use this endpoint.

2.4.8

IEPBBAX_n: Input Endpoint X-Buffer Base-Address (n=1 to 3)

7

6

5

4

3

210

A10

A9

A8

A7

A6

A5

A4

A3

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

BIT

NAME

RESET

FUNCTION

7–0

A[10:3]

x

A[10:3] of X-buffer base address (padded with 3-LSB of zeros for a total of 11 bits). This value is set by the

MCU. UBM or DMA uses this value as the start-address of a given transaction. Furthermore, UBM or DMA

does not change this value at the end of a transaction.