Datasheet

233
XMEGA B [DATASHEET]
8291B–AVR–01/2013
18.15 Register Description - Frame
18.15.1 FRAMENUML – Frame Number Low register
The FRAMENUML and FRAMENUMH registers represent the 11-bit value, FRAMENUM, that holds the frame number
from the most recently received start of frame packet.
 Bit 7:0 – FRAMENUM[7:0]: Frame Number
This byte contains the eight lsbs of the frame number (FRAMENUM).
18.15.2 FRAMENUMH – Frame Number High register
 Bit 7 – FRAMEERR: Frame Error
This flag is set if a CRC or bit-stuffing error was detected in the most recently received start of frame packet.
 Bit 6:3 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
 Bit 2:0 – FRAMENUM[10:8]: Frame Number
This byte contains the three msbs of the frame number (FRAMENUM).
Bit 76543210
+0x00 FRAMENUM[7:0]
Read/Write R R R R R R R R
Initial Value 0 0 0 0 0 0 0 0
Bit 7 6543210
+0x01 FRAMEERR
– – – – FRAMENUM[10:8]
Read/Write R R R R R R R R
Initial Value 0 0 0 0 0 0 0 0