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H8SX1663 Datasheet(PDF) 842 Page - Renesas Technology Corp |
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H8SX1663 Datasheet(HTML) 842 Page - Renesas Technology Corp |
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842 / 1158 page  Section 16 USB Function Module (USB) Rev.1.00 Jun. 07, 2006 Page 790 of 1102 REJ09B0294-0100 16.5.3 Suspend and Resume Operations (1) Suspend Operation If the USB bus enters the suspend state from the non-suspend state, perform the operation as shown in figure 16.4. USB cable connected Bus idle of 3 ms or more occurs Suspend/resume interrupt occurs (IFR2/SURSF = 1) RESUME Remote wakeup enabled? (CTLR/RWUPS = 1?) Clear SURSF in IFR2 to 0 Check if SURSS in IFR2 is set to 1 Clear SURSE in IER2 to 0 Wait for suspend/ resume interrupt Yes Yes No No Enter software standby mode Check remote-wakeup function enabled System needs to enter power-down mode? Check remote-wakeup function disabled Yes No Need to enter software standby mode? USB function Application Set SURSE in IER2 to 1 Set SSRSME in IER2 to 1 Clear SSRSME in IER2 to 0 USB module stop Figure 16.4 Suspend Operation |
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