AT83C5136-RDTUL datasheet(106/171 Pages) ATMEL

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106

AT83C5134/35/36

7683B–USB–03/07

•

Endpoint enable

Before using an endpoint, this one will 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) will 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 will 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 to endpoint specific registers.

Table 82. 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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