EFM32WG Datasheet, PDF (340/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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5. The application sets the USB_PCGCCTL.STOPPCLK bit.
6. Switch USB Core Clock (USBC) to 32 kHz.
7. Enter EM2.
Device Mode Resume (EM2 -> EM0)
Sequence if operations:
1. The core detects Resume signaling on the USB. The core generates a Resume Detected interrupt.
2. Switch USB Core Clock (USBC) back to 48 MHz.
3. The application clears the STOPPCLK bit.
4. The application clears the USB_PCGCCTL.PWRCLMP and USB_PCGCCTL.RSTPDWNMODULE
bits.
5. Restore the USB_GUSBCFG and USB_DCFG registers with the values stored during the Save
operation before entering EM2.
6. Restore the following core registers with the values stored during the Save operation before entering
EM2:
• USB_GINTMSK
• USB_GOTGCTL
• USB_GUSBCFG
• USB_GRXFSIZ
• USB_GNPTXFSIZ
• USB_DAINTMSK
• USB_DIEPMSK
• USB_DOEPMSK
• USB_DIEPx_CTL
• USB_DIEPx_TSIZ
• USB_DIEPx_DMAADDR
• USB_DIEPTXFn
7. The application programs CSRs, then sets the Power-On Programming Done bit in the Device Control
register.
Device Mode Remote Wakeup (EM2 -> EM0)
Sequence if operations:
1. An interrupt wakes up the device from EM2.
2. Switch USB Core Clock (USBC) back to 48 MHz.
3. The application clears the STOPPCLK and GATEHCLK bits in the USB_PCGCCTL register.
4. The application clears the USB_PCGCCTL.PWRCLMP and USB_PCGCCTL.RSTPDWNMODULE
bits.
5. Restore the USB_GUSBCFG and USB_DCFG registers with the values stored during the Save
operation before entering EM2 .
6. Drive remote wakeup from the core. Program USB_DCTL by performing write-only operation with the
following values:
• USB_DCTL.RMTWKUPSIG = 1
• Other Bits = Value stored during the Save operation before entering EM2
7. Clear all interrupt status. Wait for at least 1 millisecond of remote wakeup time and then program
GINSTS register with 0xFFFFFFFF to clear all the status register fields.
8. Restore the following core registers with the values stored during the Save operation before entering
EM2:
• USB_GINTMSK
• USB_GOTGCTL
• USB_GUSBCFG
• USB_GRXFSIZ
• USB_GNPTXFSIZ
• USB_DAINTMSK
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
• USB_DIEPMSK
• USB_DOEPMSK
• USB_DIEPx_CTL
• USB_DIEPx_TSIZ
• USB_DIEPx_DMAADDR
• USB_DIEPTXFn
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