SAM4L Datasheet, PDF (367/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

17.7.1.2 General Status Register
Register Name:
USBSTA
Access Type:
Read-Only
Offset:
0x0804
Reset Value:
0x00010000
31
30
29
28
27
26
-
-
-
-
-
-
23
22
21
20
19
18
-
-
-
-
-
-
15
14
13
12
11
10
-
CLKUSABLE
SPEED
-
-
7
6
5
4
3
2
-
-
-
-
-
-
• 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.
SPEED
00
01
10
11
Speed Status
full-speed mode
Reserved
low-speed mode
Reserved
• 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.
ATSAM4L4/L2
25
24
-
-
17
16
-
SUSPEND
9
8
VBUSRQ
-
1
0
-
42023C–SAM–02/2013
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