Datasheet

356
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
31.8.4 SSC Receive Frame Mode Register
Name: SSC_RFMR
Access Type: Read-write
• DATLEN: Data Length
0: Forbidden value (1-bit data length not supported).
Any other value: The bit stream contains DATLEN + 1 data bits. Moreover, it defines the transfer size performed by the PDC2
assigned to the Receiver. If DATLEN is lower or equal to 7, data transfers are in bytes. If DATLEN is between 8 and 15 (included),
half-words are transferred, and for any other value, 32-bit words are transferred.
• LOOP: Loop Mode
0: Normal operating mode.
1: RD is driven by TD, RF is driven by TF and TK drives RK.
• MSBF: Most Significant Bit First
0: The lowest significant bit of the data register is sampled first in the bit stream.
1: The most significant bit of the data register is sampled first in the bit stream.
• DATNB: Data Number per Frame
This field defines the number of data words to be received after each transfer start, which is equal to (DATNB + 1).
• FSLEN: Receive Frame Sync Length
This field defines the length of the Receive Frame Sync Signal and the number of bits sampled and stored in the Receive Sync
Data Register. When this mode is selected by the START field in the Receive Clock Mode Register, it also determines the length
of the sampled data to be compared to the Compare 0 or Compare 1 register.
Pulse length is equal to (FSLEN + 1) Receive Clock periods. Thus, if FSLEN is 0, the Receive Frame Sync signal is generated
during one Receive Clock period.
31 30 29 28 27 26 25 24
–––––––FSEDGE
23 22 21 20 19 18 17 16
– FSOS FSLEN
15 14 13 12 11 10 9 8
–––– DATNB
76543210
MSBF – LOOP DATLEN