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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 767 of 982
REJ09B0023-0400
Also, in applications that require connection detection regardless of D+ pull-up control, detection
should be carried out using IRQx or a general input port. For details, see section 20.8, Example of
USB External Circuitry.
20.4.2 Cable Disconnection
USB function
Application
Cable connected
VBUS pin = 1
USB cable disconnection
VBUS pin = 0
UDC core reset
End
Figure 20.3 Cable Disconnection Operation
The flowchart in figure 20.3 shows the operation in the case for section 20.8, Example of USB
External Circuitry.