AT80SND1C-ROTIL datasheet(84/210 Pages) ATMEL

84 / 210 page

AT8xC51SND1C

4109E–8051–06/03

Configuration

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

•

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 register. The FEN bit and the FADDEN bit in the USBCON register

should be set to allow the USB controller to answer only to requests sent at the new

address.

•

Set configuration

T he CO N F G bit in t he USBC O N r e giste r sho u ld be set a f t e r a

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

be cleared.

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 UEP-

NUM register. To select an Endpoint, the firmware has to write the endpoint number

in the UEPNUM register.

Figure 60. Endpoint Selection

UEPNUM

Endpoint 0

Endpoint 2

UEPSTA0

UEPCON0

UEPDAT0

UEPSTA2

UEPCON2

UEPDAT2

SFR Registers

UEPSTAX

UEPCONX

UEPDATX

UBYCT0

UBYCT2

UBYCTX

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