Datasheet

343
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
Figure 31-9. Receiver Block Diagram
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).
Receive Shift Register
Start
Selector
SSC_RHRSSC_RSHR
Receiver Clock
RD
SSC_RFMR.FSLEN SSC_RFMR.DATLEN
RF
SSC_CR.RXEN
SSC_CR.RXDIS
SSC_SR.RXEN
SSC_RFMR.MSBF
SSC_RCMR.STTDLY
SSC_RFMR.DATNB
TF