Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet
Product codes
ATSAM4L-EK
373
42023E–SAM–07/2013
ATSAM4L8/L4/L2
17.7.1.2
General Status Register
Register Name:
USBSTA
Access Type:
Read-Only
Offset:
0x0804
Reset Value:
0x00010000
• SUSPEND: Suspend usb transceiver state
This bit is cleared when the usb transceiver is switched off.
This bit is cleared when the usb transceiver is switched on.
• CLKUSABLE: Generic Clock Usable
This bit is cleared when the USB generic clock is not usable.
This bit is set when the USB generic clock (that should be 48MHz) is usable.
• SPEED: Speed Status
This field is set according to the controller speed mode.
• VBUSRQ: VBUS Request
0: USBC is notified that the VBUS on the usb line is not powered.
1: USBC is notified that the VBUS on the usb line is powered.
This bit is cleared when USBSTACLR.VBUSRQC is written to one.
This bit is set when USBSTASET.VBUSRQS is written to one.
This bit should only be used in host mode.
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
SUSPEND
15
14
13
12
11
10
9
8
-
CLKUSABLE
SPEED
-
-
VBUSRQ
-
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
SPEED
Speed Status
00
full-speed mode
01
Reserved
10
low-speed mode
11
Reserved