HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 543
HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
(846 pages)
- Current page: 543 of 846
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18.4
18.4.1
Figures 18.2 and 18.3 show example connections of USB function controller and external circuit.
When the USB function controller is used, a signal must be provided to the cable connection
monitor pin (USB_VSBUS). The USB_VBUS pin is multiplexed with the USB_OVR_CRNT
pin, and writing 0 to USBFSTP and 1 to USBHSTP in EXCPGCR register selects the
USB_VBUS pin functions. According to the status of the USB_VBUS pin, the USB function
controller recognizes whether the cable is connected/disconnected. Also, pin D+ must be pulled up
in order to notify the USB host/hub that the connection is established. The sample circuits in
figures 18.2 and 18.3 use the USB_PULLUP pin for pull-up control.
Figure 18.2 Example 1 of Connection between USB Function Controller and
Examples of External Circuit
Example of the Connection between USB Function Controller and External Circuit
USB function controller
This LSI
USB_PULLUP
USB_VBUS
USB_N
USB_P
3.3V
External Circuit
IC allowing voltage
application when
system power is off
IC1
27Ω
27Ω
Rev. 1.00, 02/04, page 505 of 804
IC2
IC allowing voltage
application when
system power is off
1.5kΩ
USB connector
5V
VBUS
D+
D-
GND
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