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M30245 Group
- Returning Routine of USB Function Control Unit
To return from the USB suspend state to the previous state, perform return control of the USB function
control unit as follows.
Further, clearing the bit of protect register (address 000A
synthesizer control register (address 03DC
1: Set frequency synthesizer enable bit of frequency synthesizer control register to "1".
2: Wait for 3ms.
3: Check that frequency synthesizer lock status bit of frequency synthesizer control register is set to
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"1". When this bit has been set to "0", wait for 0.1ms, and then, check again. Repeat the re-check
until the bit becomes "1".
4: Set USB clock enable bit of USB control register to "1".
Do not write to USB-related registers (other than the USBC, USBAD, and frequency synthesizer re-
lated registers) when the USB clock has been disabled in the suspend state.
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
page 165 of 354
) is required for changes in frequency
16
).
16
2. USB function
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