SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1078
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SAM3X8E
Manufacturer Part Number
SAM3X8E
Description
Manufacturer
Atmel Corporation
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39.5.1.7
1078
1078
SAM3X/A
SAM3X/A
Pad Suspend
Figure 39-8 on page 1078
Figure 39-8. Pad Behavior
Figure 39-9 on page 1078
Figure 39-9. Pad Events
T h e
(UOTGHS_DEVISR.WAKEUP) bit is cleared when a USB “Suspend” state has been detected
on the USB bus. This event automatically puts the USB pad in Idle state. The detection of a non-
idle event sets UOTGHS_DEVISR.WAKEUP, clears UOTGHS_DEVISR.SUSP and wakes up
the USB pad.
• In the Idle state, the pad is put in low-power consumption mode, i.e., the differential receiver
• In the Active state, the pad is working.
of the USB pad is off, and internal pull-downs with strong value (15 K) are set in both DP/DM
to avoid floating lines.
UOTGHS_DEVISR.WAKEUP
UOTGHS_DEVISR.SUSP
U O T G H S _ D E V I S R . S U S P
PAD State
| UOTGHS_DEVCTRL.DETACH = 1
| Suspend
UOTGHS_CTRL.USBE = 0
shows the pad behavior.
illustrates the pad events leading to a PAD state change.
S
s u
Idle
Active
e p
d n
e d
c e t
d e t
b i t
Wake-up detected
& UOTGHS_DEVCTRL.DETACH = 0
& Suspend
i s
Idle
UOTGHS_CTRL.USBE = 1
s e t
Active
l C
r a e
a n d
Cleared by software to acknowledge the interrupt
d e
n o
a w
- e k
t h e
p u
Active
W a k e - U p
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
I n t e r r u p t
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