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ATSAM4S-XPLD

567

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Figure 31-10.Transmit Start Mode

Figure 31-11.Receive Pulse/Edge Start Modes

31.7.5 Frame Sync

The Transmitter and Receiver Frame Sync pins, TF and RF, can be programmed to generate different kinds of frame
synchronization signals. The Frame Sync Output Selection (FSOS) field in the Receive Frame Mode Register
(SSC_RFMR) and in the Transmit Frame Mode Register (SSC_TFMR) are used to select the required waveform.



Programmable low or high levels during data transfer are supported.



Programmable high levels before the start of data transfers or toggling are also supported.

If a pulse waveform is selected, the Frame Sync Length (FSLEN) field in SSC_RFMR and SSC_TFMR programs the
length of the pulse, from 1 bit time up to 256

bit time.

The periodicity of the Receive and Transmit Frame Sync pulse output can be programmed through the Period Divider
Selection (PERIOD) field in SSC_RCMR and SSC_TCMR.

(Input)

(Output)

STTDLY

Start = Falling Edge on TF

Start = Rising Edge on TF

Start = Low Level on TF

Start = High Level on TF

Start = Any Edge on TF

Start = Level Change on TF

(Input)

STTDLY

Start = Falling Edge on RF

Start = Rising Edge on RF

Start = Low Level on RF

Start = High Level on RF

Start = Any Edge on RF

Start = Level Change on RF