Control Transfer - Renesas H8S Family Hardware Manual

Section 22 USB Function Module (USB)
22.5.4

Control Transfer

Control transfer consists of three stages: setup, data (not always included), and status (figure 22.9).
The data stage comprises a number of bus transactions. Operation flowcharts for each stage are
shown below.
Setup stage
Control-in
Control-out
No data
Rev. 1.00 Mar. 12, 2008 Page 872 of 1178
REJ09B0403-0100
SETUP(0) IN(1)
DATA0 DATA1
SETUP(0) OUT(1)
DATA0 DATA1
SETUP(0)
DATA0
Figure 22.9 Transfer Stages in Control Transfer
Data stage
IN(0) . . . IN(0/1)
DATA0 DATA0/1
OUT(0) . . . OUT(0/1)
DATA0 DATA0/1
Status stage
OUT(1)
DATA1
IN(1)
DATA1
IN(1)
DATA1