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ATmega16U4 Datasheet(PDF) 263 Page - ATMEL Corporation |
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ATmega16U4 Datasheet(HTML) 263 Page - ATMEL Corporation |
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263 / 408 page  263 7766D–AVR–01/09 ATmega16U4/ATmega32U4 Figure 21-12. Pad behaviour The SUSPI flag indicated that a suspend state has been detected on the USB bus. This flag automatically put the USB pad in Idle. The detection of a non-idle event sets the WAKEUPI flag and wakes-up the USB pad. Moreover, the pad can also be put in the “idle” mode if the DETACH bit is set. It come back in the active mode when the DETACH bit is cleared. 21.9 Plug-in detection The USB connection is detected by the VBUS pad, thanks to the following architecture: Idle mode Active mode USBE=1 & DETACH=0 & suspend USBE=0 | DETACH=1 | suspend SUSPI Suspend detected = USB pad power down Clear Suspend by software Resume = USB pad wake-up Clear Resume by software WAKEUPI PAD status Active Power Down Active |
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