AT83SND1CXXX-ROTIL datasheet(84/212 Pages) ATMEL

84 / 212 page

4109J–8051–10/06

AT8xC51SND1C

•

Set configuration

The CONFG bit in the USBCON register should be set after a SET_CONFIGURATION

request with a non-zero value. Otherwise, this bit should be cleared.

14.2.2

Endpoint Configuration

•

Selection of an Endpoint

The endpoint register access is performed using the UEPNUM register. The registers

–

UEPSTAX

–

UEPCONX

–UEPDATX

–UBYCTX

Theses registers correspond to the endpoint whose number is stored in the UEPNUM regis-

ter. To select an Endpoint, the firmware has to write the endpoint number in the UEPNUM

Figure 14-7. Endpoint Selection

•

Endpoint enable

Before using an endpoint, this must be enabled by setting the EPEN bit in the UEPCONX

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:

UEPNUM

Endpoint 0

Endpoint 2

UEPSTA0

UEPCON0

UEPDAT0

UEPSTA2

UEPCON2

UEPDAT2

SFR Registers

UEPSTAX

UEPCONX

UEPDATX

UBYCT0

UBYCT2

UBYCTX

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