at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 523

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

Figure 33-9. Receiver Block Diagram
33.6.4
6384B–ATARM–15-Dec-08
SSC_RCMR.STTDLY
Receiver Clock
Start
RF
Selector
Start
TF
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:
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).
• Continuous. In this case, the transmission starts as soon as a word is written in SSC_THR
• 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
and the reception starts as soon as the Receiver is enabled.
SSC_RFMR.MSBF
SSC_RFMR.FSLEN
SSC_RSHR
Receive Shift Register
SSC_RFMR.DATNB
SSC_RFMR.DATLEN
SSC_RHR
AT91SAM9G20 Preliminary
SSC_CR.RXEN
SSC_CR.RXDIS
SSC_SR.RXEN
RD
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