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AT90USB646 Datasheet(PDF) 266 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 266 Page - ATMEL Corporation |
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266 / 459 page  266 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 21.13 USB Software Operating modes Depending on the USB operating mode, the software should perform some the following operations: Power On the USB interface • Power-On USB pads regulator • Configure PLL interface • Enable PLL and wait 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 pad regulator Suspending the USB interface • Clear Suspend Bit • Freeze USB 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 • Unfreeze USB clock • Clear Resume information |
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