AT89C5131A-RDTIL datasheet(119/185 Pages) ATMEL

119 / 185 page

119

AT89C5131A-L

4338E–USB–06/06

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 13.).

The USB controller will 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 will be stored in the

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

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

address.

•

Set configuration

T h e C O NF G b i t i n th e USBC O N r e g i st e r h a s to b e se t a fte r a

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

cleared.

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 UEP-

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

in the UEPNUM register.

Figure 59. Endpoint Selection

UEPNUM

Endpoint 0

Endpoint 6

UEPSTA0

UEPCON0

UEPDAT0

UEPSTA6

UEPCON6

UEPDAT6

SFR registers

UEPSTAX

UEPCONX

UEPDATX

UBYCTH0

UBYCTL0

UBYCTH6

UBYCTL6

UBYCTHX

UBYCTLX

AT89C5131A-RDTIL Datasheet(PDF) 119 Page - ATMEL Corporation

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