AT83SND2CMP3B datasheet(107/241 Pages) ATMEL

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107

4341F–MP3–03/06

AT8xC51SND2C/MP3B

16.4

Configuration

16.4.1

General Configuration

•

USB controller enable

Before any USB transaction, the 48 MHz required by the USB controller must be correctly

generated (See “Clock Controller” on page 19).

The USB controller should be then enabled by setting the EUSB bit in the USBCON register.

•

Set address

After a Reset or a USB reset, the software has to set the FEN (Function Enable) bit in the

USBADDR register. This action will allow the USB controller to answer to the requests sent

at the address 0.

When a SET_ADDRESS request has been received, the USB controller must only answer

to the address defined by the request. The new address should be stored in the USBADDR

the USB controller to answer only to requests sent at the new address.

•

Set configuration

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

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

16.4.2

Endpoint Configuration

•

Selection of an Endpoint

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

–

UEPSTAX

–UEPCONX

–UEPDATX

–UBYCTX

Theses 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 16-7.

Endpoint Selection

•

Endpoint enable

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

UEPNUM

Endpoint 0

Endpoint 2

UEPSTA0

UEPCON0

UEPDAT0

UEPSTA2

UEPCON2

UEPDAT2

SFR Registers

UEPSTAX

UEPCONX

UEPDATX

UBYCT0

UBYCT2

UBYCTX

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