at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 100

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

USB Software Operating modes
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AT85C51SND3B
Depending on the USB operating mode, the software should perform some of the follow-
ing operations:
Power On the USB interface
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Power Off the USB interface
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Suspending the USB interface
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Resuming the USB interface
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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
Detach USB interface
Disable USB interface
Disable PLL
Disable USB pin regulator
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
Enable PLL
Wait PLL lock
Clear USB suspend clock
Clear Resume information
7632C–MP3–11/06