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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 789 of 982
REJ09B0023-0400
20.9
USB Bus Power Control Method
20.9.1
USB Bus Power Control Operation
This LSI can operate using a USB bus power control method.
The following describes notes on the LSI using the USB bus power control method.
Changing to High-Power Function: According to the USB standard, the startup operation (from
connecting cables to completing enumeration) is handled as a low-power function. Changing to
the high-power function can be checked by detecting reception of a SET_CONFIGURATION
request from USBIFR2 and IFRIER2/SETC and confirming USBIFR2/CFGV = 1.
Suspending: In this LSI, an interrupt by detecting the USB suspend signal or awake signal can be
shared with an
IRQ0
or
IRQ1
interrupt by specifying USBCTRL/SUSPEND = 1. (See
figure 20.19.)
This causes an
IRQ1
interrupt to occur by specifying USBIFR2/SUSPS = 1 to change the LSI
state to the standby mode. An
IRQ0
interrupt occurs by specifying USBIFR2/AWAKE=1, the LSI
can be returned from the standby mode. Since the LSI must enter the USB suspend state within 10
ms after the USB suspend signal is detected, an
IRQ1
interrupt must be set to be processed prior to
other interrupts. When the
IRQ0
interrupt priority is lower than the interrupt request mask level
(SR/I[3:0]), the LSI cannot be returned from the suspend state. Make sure that the
IRQ0
interrupt
priority is higher than the interrupt request mask level (SR/I[3:0]). Figure 20.20 shows the
operation timing.
Содержание HD6417641
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Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
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...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
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...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
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