NEC mPD78F0730 Preliminary User's Manual page 390

Note INTPx means an external interrupt pin of the
Allocate one external interrupt pin to the following applications.
• Detecting disconnection of the connector in the case of self-powered mode (SFPW bit of UF0DSTL
register = 1). In this case, monitor the VDD line of the USB connector, and input the result to the
external interrupt pin at the edge.
• Detecting turning off power from a HUB chip when the device is mounted on the same board as a
HUB.
♦: Processing by hardware
Remark
390
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CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Figure 12-25. Example of Processing After Power Application/Power Failure (3/3)
(b) Processing on power failure
Power failure
INTPx active
Interrupt servicing
Processing such as
clearing FIFO or
MRST = 1 (UF0GPR)
Preliminary User's Manual U19014EJ1V0UD
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No
Note
?
Yes
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µ
PD78F0730 (INTP0 to INTP3).