Processing Of Usb Standard Commands And Class/Vendor Commands - Renesas H8S Family Hardware Manual

Section 22 USB Function Module (USB)

Processing of USB Standard Commands and Class/Vendor

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 22.7 below.

Table 22.7 Command Decoding on Application Side

Decoding not Necessary on Application Side

Clear Feature

Get Configuration

Get Interface

Set Configuration

Set Interface

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 reception is completed successfully, the IFR0/SETUP TS flag is set and an interrupt

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

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

Rev. 1.00 Mar. 12, 2008 Page 882 of 1178

REJ09B0403-0100

Decoding Necessary on Application Side

Get Descriptor

Class/Vendor command

Set Descriptor