Rainbow-electronics AT89C5131 Bedienungsanleitung PDF herunterladen (Seite 118)

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AT89C5131

4136A–USB–03/03

• 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 81. Summary of Endpoint Configuration

Endpoint Configuration EPEN EPDIR EPTYPE UEPCONX

Disabled 0b Xb XXb 0XXX XXXb

Control 1b Xb 00b 80h

Bulk-in 1b 1b 10b 86h

Bulk-out 1b 0b 10b 82h

Interrupt-In 1b 1b 11b 87h

Interrupt-Out 1b 0b 11b 83h

Isochronous-In 1b 1b 01b 85h

Isochronous-Out 1b 0b 01b 81h

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 174 175

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Rainbow-electronics AT89C5131 Bedienungsanleitung Seite 118