at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 536

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

33.8.4
Name:
Access Type:
• 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 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.
This field is used with FSLEN_EXT to determine the pulse length of the Receive Frame Sync signal.
Pulse length is equal to FSLEN + (FSLEN_EXT * 16) + 1 Receive Clock periods.
536
FSLEN_EXT
MSBF
31
23
15
–
–
7
AT91SAM9G20 Preliminary
SSC Receive Frame Mode Register
FSLEN_EXT
30
22
14
SSC_RFMR
Read-write
–
6
–
FSLEN_EXT
LOOP
FSOS
29
21
13
–
5
FSLEN_EXT
28
20
12
–
4
27
19
11
–
3
DATLEN
26
18
10
–
2
FSLEN
DATNB
25
17
–
9
1
6384B–ATARM–15-Dec-08
FSEDGE
24
16
8
0