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DOC7707 Datasheet(PDF) 192 Page - List of Unclassifed Manufacturers |
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DOC7707 Datasheet(HTML) 192 Page - List of Unclassifed Manufacturers |
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192 / 307 page  192 7707F–AVR–11/10 AT90USB82/162 Figure 19-11. 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. 19.8 D+/D- Read/write The level of D+ and D- can be read and written using the UPOE register. The USB controller has to be enabled to write a value. For read operation, the USB controller can be enabled or disabled. 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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