AT89C5122DS-RDRUM datasheet(98/208 Pages) ATMEL

98 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

•

Endpoint enable

Before using an endpoint, this one should be enabled by setting the EPEN bit in the

UEPCONX 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 Con-

trol 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:

Make sure to select the correct endpoint number in the UEPNUM register before

accessing to endpoint specific registers.

Table 62.

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

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