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18.4.2
Cable Disconnection
USB function
Application
Cable connected
VBUS pin = 1
USB cable disconnection
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
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 18.4 Transfer Stages in Control Transfer
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