Data Sheet

776
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
31.8.1.4 Finite State Machine Status
Name:
FSMSTATUS
Offset: 0x0D
Reset: 0xXXXX
Property: Read only
z Bits 7 – Reserved
This bit is unused and reserved for future use. For compatibility with future devices, always write this bit to zero
when this register is written. This bit will always return zero when read.
z Bits 6:0 – FSMSTATE[6:0]: Fine State Machine Status
These bits indicate the state of the finite state machine of the USB controller.
Bit76543210
FSMSTATE[6:0]
AccessRRRRRRRR
Reset00000001
FSMSTATE[6:0] Description
0x01 OFF (L3). Corresponds to the powered-off, disconnected, and disabled state
0x02 ON (L0). Corresponds to the Idle and Active states
0x04 SUSPEND (L2)
0x08 SLEEP (L1)
0x10 DNRESUME. Down Stream Resume.
0x20 UPRESUME. Up Stream Resume.
0x40 RESET. USB lines Reset.
Others Reserved