SH7280 Datasheet, PDF (1380/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 25 USB Function Module
The flowchart in figure 25.2 shows the operation in the case for section 25.10, Example of USB
External Circuitry.
In applications that do not require USB cable connection to be detected, processing by the USB
bus connection interrupt is not necessary. Preparations should be made with the bus reset interrupt.
Also, in applications that require connection detection regardless of USD+ pull-up control,
detection should be carried out using IRQx or a general input port. For details, see section 25.10,
Example of USB External Circuitry.
25.5.2 Cable Disconnection
USB function
Cable connected
VBUS pin = 1
Application
USB cable disconnection
VBUS pin = 0
UDC core reset
End
Figure 25.3 Cable Disconnection Operation
The flowchart in figure 25.3 shows the operation in the case for section 25.10, Example of USB
External Circuitry.
Rev. 1.00 Jun. 26, 2008 Page 1350 of 1692
REJ09B0393-0100