HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 823
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HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417320.pdf
(1524 pages)
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• Detection of USB Cable Connection/Disconnection
23.4.2
Figures 23.4 and 23.5 show example connections of the USB host controller and transceiver.
Figure 23.4 shows an example connection using the built-in transceiver 1. By using the
USB2_ovr_current, USB2_pwr_en, USB2_P, and USB2_M pins in an external circuit similar to
that in figure 23.4, you can also use built-in USB transceiver 2. Figure 23.5 shows an example
connection when not using the built-in USB transceiver. When using the USB host controller, a
separate LSI must be used for USB power bus control (equivalent to the USB power control LSIs
in figures 23.4 and 23.5). Make sure the LSI has the power supply capacity to satisfy the USB
standard, and select one that has an overcurrent protection function. Configure the system so that
the input to the USB1_ovr_current pin is Low on detection of an overcurrent.
As USB function controller in this LSI manages the state by hardware, USB_VBUS signal is
necessary to recognize connection or disconnection of the USB cable. The power supply signal
(VBUS) in the USB cable is used for USBF_VBUS. However, if the cable is connected to the
USB host or hub when the power of USB function controller (this LSI—installed system) is
off, a voltage of 5 V will be applied from the USB host or hub.
Therefore, use an IC such that allows voltage application when system power is off (for
example, HD74LV1G08A) for the IC1 in figures 23.2 to 23.5.
To recover from the standby state with the USB cable connected, the IRQ pin should be
connected to the USB cable. (Recovery from the software standby state cannot be performed
by a USB connection/disconnection interrupt.)
Example of the Connection between USB Host Controller and Transceiver
Rev. 3.00 Jan. 18, 2008 Page 761 of 1458
Section 23
USB Pin Multiplex Controller
REJ09B0033-0300
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