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H8SX/1663M Datasheet(PDF) 1043 Page - Renesas Technology Corp |
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H8SX/1663M Datasheet(HTML) 1043 Page - Renesas Technology Corp |
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1043 / 1504 page  Section 20 USB Function Module (USB) Rev. 2.00 Sep. 24, 2008 Page 1011 of 1468 REJ09B0412-0200 (5) Remote-Wakeup Operation If the USB bus enters the non-suspend (resume) state from the suspend state by the remote- wakeup signal output from this function, perform the operation as shown in figure 20.10. USB cable connected USB bus in suspend state Cancel software standby mode Clear SURSF in IFR2 to 0 Check if SURSS in IFR2 is cleared to 0 Software standby mode ? USB module stopped? Oscillation stabilization time has passed? No No No Yes Yes Yes Start USB operating clock oscillation Cancel USB module stop Remote wakeup execution (CTLR/RSME= 1) Return to normal state Yes No Bus wakeup source generated Remote wakeup enabled? (CTLR/RWUPS = 1?) Wait for resume from up-stream Resume output signal Suspend/resume interrupt occurs. (IFR2/SURSF = 1) RESUME USB function Application Figure 20.10 Remote-Wakeup |
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