HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 625

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

20.4.2
The above flowchart shows the operation in section 20.7, Example of External Circuitry for USB
Function Controller.
For details, see section 20.7, Example of External Circuitry for USB Function Controller.
20.4.3
Control transfer consists of three stages: setup, data (not always included), and status (figure 20.6).
The data stage comprises a number of bus transactions. Operation flowcharts for each stage are
shown below.
Control-in
Control-out
No data
Cable Disconnection
Control Transfer
Setup stage
SETUP(0)
SETUP(0)
SETUP(0)
USB cable disconnection
DATA0
DATA0
DATA0
Figure 20.6 Transfer Stages in Control Transfer
USB_VBUS pin = 0
Cable connected
UDC core reset
Figure 20.5 Cable Disconnection Operation
USB function
VBUS pin = 1
End
OUT(1)
DATA1
DATA1
IN(1)
OUT(0)
Data stage
DATA0
DATA0
IN(0)
. . .
. . .
Rev. 1.00, 02/04, page 587 of 804
Application
OUT(0/1)
DATA0/1
DATA0/1
IN(0/1)
Status stage
OUT(1)
DATA1
DATA1
DATA1
IN(1)
IN(1)