7643 datasheet(260/424 Pages) RENESAS

260 / 424 page

Rev.2.00

Aug 28, 2006

page 139 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.34 Structure of SET_ADDRESS request

Fig. 2.6.35 Register setting (processing when SET_ADDRESS is received)

bmRequestType

bRequest

wValue

windex

wlength

00000000B

SET_ADDRESS

(Code: 0516)

Device • address

Low-

order

High-

order

0 byte

7th byte

Endpoint 0 IN/OUT FIFO register

USB endpoint 0 FIFO (Address : 6016)

USBFIFO0

USB endpoint index register (Address : 5816)

USBINDEX

USB endpoint 0 IN control register (Address : 5916)

IN_CSR

This register maintains the 7-bit USB function control unit address

USB address register (Address : 5016)

USBA

OUT_PKT_RDY flag

SERVICED_SETUP_END bit

Endpoint index: Endpoint 0

(4)

Application example 4: Standard device • request (SET_ADDRESS) receive

Outline: M37643 performs enumeration process after USB cable connection.

The USB endpoint 0 interrupt occurs when data is received successfully from the host

CPU in an endpoint 0 control transfer. Whether the data was received in the setup stage

or the data stage is not determined by hardware. The user needs to determine the

received data by software and execute the process in an interrupt routine accordingly.

For details on the data configuration of the standard device request, refer to the Full-

Speed USB 2.0 specification.

The process at a SET_ADDRESS receive is shown as a control example.

The SET_ADDRESS request for the address setting is received from the host CPU, and it is set

in the USB address register (address 005016). The USB FCU uses this address for all subsequent

device accesses. A standard device request comprises 8 bytes.

Figure 2.6.34 shows the structure of the SET_ADDRESS request, Figure 2.6.35 shows the related

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