Datasheet

1113
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
39.6.2.8 Device Endpoint Register
Name: UOTGHS_DEVEPT
Address: 0x400AC01C
Access: Read-write
• EPRSTx: Endpoint x Reset
Writing a one to this bit will reset the endpoint x FIFO prior to any other operation, upon hardware reset or when a USB bus
reset has been received. This resets the endpoint x registers (UOTGHS_DEVEPTCFGx, UOTGHS_DEVEPTISRx,
UOTGHS_DEVEPTIMRx) but not the endpoint configuration (UOTGHS_DEVEPTCFGx.ALLOC,
UOTGHS_DEVEPTCFGx.EPBK, UOTGHS_DEVEPTCFGx.EPSIZE, UOTGHS_DEVEPTCFGx.EPDIR,
UOTGHS_DEVEPTCFGx.EPTYPE).
All the endpoint mechanism (FIFO counter, reception, transmission, etc.) is reset apart from the Data Toggle Sequence
field (UOTGHS_DEVEPTISRx.DTSEQ) which can be cleared by setting the UOTGHS_DEVEPTIMRx.RSTDT bit (by writ-
ing a one to the UOTGHS_DEVEPTIERx.RSTDTS bit).
The endpoint configuration remains active and the endpoint is still enabled.
Writing a zero to this bit will complete the reset operation and start using the FIFO.
This bit is cleared upon receiving a USB reset.
• EPENx: Endpoint x Enable
0: The endpoint x is disabled, what forces the endpoint x state to inactive (no answer to USB requests) and resets the end-
point x registers (UOTGHS_DEVEPTCFGx, UOTGHS_DEVEPTISRx, UOTGHS_DEVEPTIMRx) but not the endpoint
configuration (UOTGHS_DEVEPTCFGx.ALLOC, UOTGHS_DEVEPTCFGx.EPBK, UOTGHS_DEVEPTCFGx.EPSIZE,
UOTGHS_DEVEPTCFGx.EPDIR, UOTGHS_DEVEPTCFGx.EPTYPE).
1: The endpoint x is enabled.
31 30 29 28 27 26 25 24
–––––––EPRST8
23 22 21 20 19 18 17 16
EPRST7 EPRST6 EPRST5 EPRST4 EPRST3 EPRST2 EPRST1 EPRST0
15 14 13 12 11 10 9 8
–––––––EPEN8
76543210
EPEN7 EPEN6 EPEN5 EPEN4 EPEN3 EPEN2 EPEN1 EPEN0