Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
1114
39.6.2.9 Device Frame Number Register
Name: UOTGHS_DEVFNUM
Address: 0x400AC020
Access: Read-only
• FNCERR: Frame Number CRC Error
This bit is set when a corrupted frame number (or micro-frame number) is received. This bit and the SOF (or MSOF) inter-
rupt bit are updated at the same time.
This bit is cleared upon receiving a USB reset.
• FNUM: Frame Number
This field contains the 11-bit frame number information. It is provided in the last received SOF packet.
This field is cleared upon receiving a USB reset.
FNUM is updated even if a corrupted SOF is received.
• MFNUM: Micro Frame Number
This field contains the 3-bit micro frame number information. It is provided in the last received MSOF packet.
This field is cleared at the beginning of each start of frame (SOF interrupt) or upon receiving a USB reset.
MFNUM is updated even if a corrupted MSOF is received.
31 30 29 28 27 26 25 24
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15 14 13 12 11 10 9 8
FNCERR – FNUM
76543210
FNUM MFNUM