SH7721 datasheet(917/1524 Pages) RENESAS

917 / 1524 page

Section 25

USB Function Controller (USBF)

Rev. 3.00 Jan. 18, 2008 Page 855 of 1458

REJ09B0033-0300

25.7

Processing of USB Standard Commands and Class/Vendor

Commands

25.7.1

Processing of Commands Transmitted by Control Transfer

A command transmitted from the host by control transfer may require decoding and execution of

command processing on the application side. Whether command decoding is required on the

application side is indicated in table 25.5 below.

Table 25.5

Command Decoding on Application Side

Decoding not Necessary on Application Side

Decoding Necessary on Application Side

Clear feature

Get configuration

Get interface

Get status

Set address

Set configuration

Set feature

Set interface

Get descriptor

Class/Vendor command

Synch frame

Set descriptor

If decoding is not necessary on the application side, command decoding and data stage and status

stage processing are performed automatically. No processing is necessary by the user. An interrupt

is not generated in this case.

If decoding is necessary on the application side, this module stores the command in the EP0s

FIFO. After normal reception is completed, the IFR0/SETUP TS flag is set and an interrupt

request is generated. In the interrupt routine, 8 bytes of data must be read from the EP0s data

should then be carried out according to the result of the decoding operation.

SH7721 Datasheet(PDF) 917 Page - Renesas Technology Corp