Datasheet

876
32117D–AVR-01/12
AT32UC3C
Figure 32-3. Speed Selection in device mode
• Host mode
When the USBC interface is in host mode, internal pull-downs are enabled on both DP and DM.
The interface detects the speed of the connected device and reflects this in the Speed Status
field (USBSTA.SPEED).
32.6.1.5 Data management
Endpoints and pipe buffers can be allocated anywhere in the embedded memory (CPU RAM or
HSB RAM).
See ”RAM management” on page 882.
32.6.1.6 Pad Suspend
Figure 32-4 illustrates the behavior of the USB pad in device mode.
Figure 32-4. Pad Behavior
• In Idle state, the pad is in low power consumption mode.
• In Active state, the pad is working.
Figure 32-5 illustrates the pad events leading to a PAD state change.
R
PU
UDCON.DETACH
DP
DM
UDCON.LS
VBUS
Idle
Active
USBE = 1
& DETACH = 0
& Suspend
USBE = 0
| DETACH = 1
| Suspend