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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 766 of 982
REJ09B0023-0400
20.4 Operation
20.4.1 Cable
Connection
Cable disconnected
VBUS pin = 0 V
UDC core reset
USB cable connection
USBIFR1/VBUS = 1
USB bus connection interrupt
UDC core reset release
Bus reset reception
USBIFR0/BRST = 1
Bus reset interrupt
Wait for setup command
reception complete interrupt
USB function
Application
General output port
D+ pull-up enabled?
USB module interrupt
setting
As soon as preparations are
completed, enable D+ pull-up
in general output port
Clear VBUS flag
(USBIFR1/VBUS)
Firmware preparations for
start of USB communication
Clear bus reset flag
(USBIFR0/BRST)
Clear FIFOs
(EP0, EP1, EP2, EP3)
Yes
No
Initial
settings
Wait for setup command
reception complete interrupt
Interrupt request
Interrupt request
Figure 20.2 Cable Connection Operation
The flowchart in figure 20.2 shows the operation in the case for section 20.8, 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.
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
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Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
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