Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)
R01UH0042EJ0500 Rev.5.00 Page 1221 of 1513
Aug 12, 2011
Figure 21-31. Example of Processing After Power Application/Power Failure (3/3)
(b) Processing on power failure
Yes
INTPxx active
Note
?
No
Interrupt servicing
Processing such as
clearing FIFO or
MRST = 1 (UF0GPR)
START
END
Power failure
Note INTPxx indicates the external interrupt pins of the V850ES/JG3-H and V850ES/JH3-H (INTP00 to
INTP18), and also indicates interrupts input by the external trigger pins (TIAA00, TAA01, TIAA10,
TIAA11, TIAA20, TIAA21, TIAA30, TIAA31, TIAA50, TIAA51, TIAB00, TIAB10, TRGAB1, TIT00) of the
timer.
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. Note that the noise elimination time is that of the interrupt input pin,
and that of each timer.
• Detecting turning off power from the HUB when the device is mounted on the same board as a HUB
chip.
Remark ♦: Processing by hardware