Atmel AT85DVK-07 Spezifikationen PDF herunterladen (Seite 100)

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AT85C51SND3Bx

7632A–MP3–03/06

USB Software Operating modes

Depending on the USB operating mode, the software should perform some of the follow-

ing operations:

Power On the USB interface

• Power-On USB pads regulator

• Wait USB pads regulator ready state

• Configure PLL interface

• Enable PLL

• Check PLL lock

• Enable USB interface

• Configure USB interface (USB speed, Endpoints configuration...)

• Wait for USB VBUS information connection

• Attach USB device

Power Off the USB interface

• Detach USB interface

• Disable USB interface

• Disable PLL

• Disable USB pin regulator

Suspending the USB interface

• Clear Suspend Bit

• Set USB suspend clock

• Disable PLL

• Be sure to have interrupts enable to exit sleep mode

• Make the MCU enter sleep mode

Resuming the USB interface

• Enable PLL

• Wait PLL lock

• Clear USB suspend clock

• Clear Resume information

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Atmel AT85DVK-07 Spezifikationen Seite 100