HD6417705 Datasheet, PDF (501/739 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

18.4.2 Cable Disconnection
USB function
Cable connected
VBUS pin = 1
USB cable disconnection
Application
VBUS pin = 0
UDC core reset
End
Figure 18.3 Cable Disconnection Operation
The above flowchart shows the operation in section 18.8, Example of USB External Circuitry.
18.4.3 Control Transfer
Control transfer consists of three stages: setup, data (not always included), and status (figure 18.4).
The data stage comprises a number of bus transactions. Operation flowcharts for each stage are
shown below.
Control-in
Setup stage
SETUP(0)
DATA0
Control-out
SETUP(0)
DATA0
No data
SETUP(0)
DATA0
IN(1)
DATA1
OUT(1)
DATA1
Data stage
IN(0)
DATA0
...
IN(0/1)
DATA0/1
OUT(0)
DATA0
. . . OUT(0/1)
DATA0/1
Status stage
OUT(1)
DATA1
IN(1)
DATA1
IN(1)
DATA1
Figure 18.4 Transfer Stages in Control Transfer
Rev. 2.00, 09/03, page 455 of 690