Datasheet

253
7593L–AVR–09/12
AT90USB64/128
both Pipe/Endpoint 4 and 5 use a common area. The data of those endpoints are potentially
lost
Note that:
• the data of Pipe/Endpoint 0 are never lost whatever the activation or deactivation of the
higher Pipe/Endpoint. Its data is lost if it is deactivated
• Deactivate and reactivate the same Pipe/Endpoint with the same parameters does not lead
to a “slide” of the higher endpoints. For those endpoints, the data are preserved
• CFGOK is set by hardware even in the case where there is a “conflict” in the memory
allocation
22.8 PAD suspend
The next figures illustrates the pad behaviour:
• In the “idle” mode, the pad is put in low power consumption mode
• In the “active” mode, the pad is working
Figure 22-15. 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.
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