Datasheet

Section 16 USB Function Module (USB)
Page 998 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
16.5.5 Control Transfer
Control transfer consists of three stages: setup, data (not always included), and status (figure
16.10). The data stage comprises a number of bus transactions. Operation flowcharts for each
stage are shown below.
Control-in
Setup stage Data stage Status stage
Control-out
No data
SETUP(0)
DATA0
SETUP(0)
DATA0
SETUP(0)
DATA0
IN(1)
DATA1
OUT(1)
DATA1
IN(0)
DATA0
OUT(0)
. . .
. . .
DATA0
IN(0/1)
DATA0/1
OUT(0/1)
DATA0/1
OUT(1)
DATA1
IN(1)
DATA1
IN(1)
DATA1
Figure 16.10 Transfer Stages in Control Transfer