Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105 Data Sheet
Product codes
ATEVK1105
553
AT32UC3A
30.8.1.10
USB Finite State Machine Status Register (USBFSM)
Offset:
0x082C
Register Name:
USBFSM
Access Type:
Read-Only
Read Value:
0x00000009
• DRDSTATE
This field indicates the state of the USB controller.
Refer to the OTG specification for more details.
Refer to the OTG specification for more details.
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
0
0
0
0
0
0
0
0
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
-
-
-
-
-
-
-
-
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
-
-
-
-
DRDSTATE
r
0
0
0
0
1
0
0
1
USBFSM
Description
0
a_idle state : this is the start state for A-devices (when the ID pin is 0)
1
a_wait_vrise : In this state, the A-device waits for the voltage on VBus to rise above the A-
device VBus Valid threshold (4.4 V).
2
a_wait_bcon : In this state, the A-device waits for the B-device to signal a connection.
3
a_host : In this state, the A-device that operates in Host mode is operational.
4
a_suspend : The A-device operating as a host is in the suspend mode.
5
a_peripheral : The A-device operates as a peripheral.
6
a_wait_vfall : In this state, the A-device waits for the voltage on VBus to drop below the A-
device Session Valid threshold (1.4 V).
7
a_vbus_err : In this state, the A-device waits for recovery of the overcurrent condition that
caused it to enter this state.
8
a_wait_discharge : In this state, the A-device waits for the data usb line to discharge (100
us).
9
b_idle : this is the start state for B-device (when the ID pin is 1).
10
b_peripheral : In this state, the B-device acts as the peripheral.
32058K
AVR32-01/12