AT83SND2CMP3B datasheet(108/241 Pages) ATMEL

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108

4341F–MP3–03/06

AT8xC51SND2C/MP3B

An endpoint which is not enabled won’t answer to any USB request. The Default Control

Endpoint (Endpoint 0) should always be enabled in order to answer to USB standard

requests.

•

Endpoint type configuration

All Standard Endpoints can be configured in Control, Bulk, Interrupt or Isochronous mode.

The Ping-pong Endpoints can be configured in Bulk, Interrupt or Isochronous mode. The

configuration of an endpoint is performed by setting the field EPTYPE with the following

values:

–

Control:

EPTYPE = 00b

–

Isochronous: EPTYPE = 01b

–

Bulk:

EPTYPE = 10b

–

Interrupt:

EPTYPE = 11b

The Endpoint 0 is the Default Control Endpoint and should always be configured in Control

type.

•

Endpoint direction configuration

For Bulk, Interrupt and Isochronous endpoints, the direction is defined with the EPDIR bit of

the UEPCONX register with the following values:

–

IN:

EPDIR = 1b

–

OUT:

EPDIR = 0b

For Control endpoints, the EPDIR bit has no effect.

•

Summary of Endpoint Configuration:

Do not forget to select the correct endpoint number in the UEPNUM register before access-

ing endpoint specific registers.

Table 16-1.

Summary of Endpoint Configuration

•

Endpoint FIFO reset

Before using an endpoint, its FIFO should be reset. This action resets the FIFO pointer to its

original value, resets the Byte counter of the endpoint (UBYCTX register), and resets the

data toggle bit (DTGL bit in UEPCONX).

The reset of an endpoint FIFO is performed by setting to 1 and resetting to 0 the corre-

sponding bit in the UEPRST register.

For example, in order to reset the Endpoint number 2 FIFO, write 0000 0100b then 0000

0000b in the UEPRST register.

Note that the endpoint reset doesn’t reset the bank number for ping-pong endpoints.

Endpoint Configuration

EPEN

EPDIR

EPTYPE

UEPCONX

Disabled

XXb

0XXX XXXb

Control

00b

80h

Bulk-in

10b

86h

Bulk-out

10b

82h

Interrupt-In

11b

87h

Interrupt-Out

11b

83h

Isochronous-In

01b

85h

Isochronous-Out

01b

81h

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