SAM7X128_14 Datasheet, PDF (343/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Figure 31-9. Receiver Block Diagram
SSC_CR.RXEN
SSC_SR.RXEN
SSC_CR.RXDIS
RF TF
SSC_RFMR.MSBF SSC_RFMR.DATNB
Receiver Clock _Start
Selector
Receive Shift Register
RD
SSC_RCMR.STTDLY
SSC_RSHR
SSC_RHR
SSC_RFMR.FSLEN SSC_RFMR.DATLEN
31.6.4 Start
The transmitter and receiver can both be programmed to start their operations when an event occurs, respectively in the
Transmit Start Selection (START) field of SSC_TCMR and in the Receive Start Selection (START) field of SSC_RCMR.
Under the following conditions the start event is independently programmable:
 Continuous. In this case, the transmission starts as soon as a word is written in SSC_THR and the reception starts
as soon as the Receiver is enabled.
 Synchronously with the transmitter/receiver
 On detection of a falling/rising edge on TF/RF
 On detection of a low level/high level on TF/RF
 On detection of a level change or an edge on TF/RF
A start can be programmed in the same manner on either side of the Transmit/Receive Clock Register (RCMR/TCMR).
Thus, the start could be on TF (Transmit) or RF (Receive).
Moreover, the Receiver can start when data is detected in the bit stream with the Compare Functions.
Detection on TF/RF input/output is done by the field FSOS of the Transmit/Receive Frame Mode Register
(TFMR/RFMR).
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
343