Datasheet

280
AT32UC3A
25.9.4 Receive Frame Mode Register
Name: RFMR
Access Type: Read/Write
Offset: 0x14
Reset value: 0x00000000
• FSLENHI: Receive Frame Sync Length High part
The four MSB of the FSLEN bitfield.
• FSEDGE: Frame Sync Edge Detection
Determines which edge on Frame Sync will generate the interrupt RXSYN in the SSC Status Register.
• FSOS: Receive Frame Sync Output Selection
• 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 deter-
mines the length of the sampled data to be compared to the Compare 0 or Compare 1 register. Note: The four most
significant bits fo this bitfield are in the FSLENHI bitfield.
Pulse length is equal to ({FSLENHI,FSLEN} + 1) Receive Clock periods. Thus, if {FSLENHI,FSLEN} is 0, the Receive
Frame Sync signal is generated during one Receive Clock period.
• DATNB: Data Number per Frame
31 30 29 28 27 26 25 24
FSLENHI – – – FSEDGE
23 22 21 20 19 18 17 16
– FSOS FSLEN
15 14 13 12 11 10 9 8
– – – – DATNB
7 6 5 4 3 2 1 0
MSBF – LOOP DATLEN
FSEDGE Frame Sync Edge Detection
0x0 Positive Edge Detection
0x1 Negative Edge Detection
FSOS Selected Receive Frame Sync Signal RX_FRAME_SYNC Pin
0x0 None Input-only
0x1 Negative Pulse Output
0x2 Positive Pulse Output
0x3 Driven Low during data transfer Output
0x4 Driven High during data transfer Output
0x5 Toggling at each start of data transfer Output
0x6-0x7 Reserved Undefined
32058K
AVR32-01/12