AT80SND1C-ROTIL datasheet(85/210 Pages) ATMEL

85 / 210 page

AT8xC51SND1C

4109E–8051–06/03

•

Endpoint enable

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

CONX register.

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

accessing endpoint specific registers.

Table 89. Summary of Endpoint Configuration

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

AT80SND1C-ROTIL Datasheet(PDF) 85 Page - ATMEL Corporation

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