AT89C5131A-RDTUM datasheet(123/188 Pages) ATMEL

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4337K–USB–04/08

AT89C5130A/31A-M

• Set configuration

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

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

21.2.2

Endpoint Configuration

• Selection of an Endpoint

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

– UEPSTAX

– UEPCONX

– UEPDATX

– UBYCTLX

– UBYCTHX

These 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 21-5. Endpoint Selection

• Endpoint enable

Before using an endpoint, this one will 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) 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

UEPNUM

Endpoint 0

Endpoint 6

UEPSTA0

UEPCON0

UEPDAT0

UEPSTA6

UEPCON6

UEPDAT6

SFR registers

UEPSTAX

UEPCONX

UEPDATX

UBYCTH0

UBYCTL0

UBYCTH6

UBYCTL6

UBYCTHX

UBYCTLX

AT89C5131A-RDTUM Datasheet(PDF) 123 Page - ATMEL Corporation

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