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AT90USB646 Datasheet(PDF) 260 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 260 Page - ATMEL Corporation

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260
7593A–AVR–02/06
AT90USB64/128
Figure 21-15. 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.
21.10 OTG timers customizing
It is possible to refine some OTG timers thanks to the OTGTCON and OTGCON registers
• PAGE=00b: AWaitVrise time-out. [OTG] chapter 6.6.5.1
• VALUE=00bTime-out is set to 20 ms
• VALUE=01bTime-out is set to 50 ms
• VALUE=10bTime-out is set to 70ms
• VALUE=11bTime-out is set to 100 ms
• PAGE=01b: VbBusPulsing. [OTG] chapter 5.3.4
• VALUE=00bTime-out is set to 15 ms
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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