Atmel Evaluation Kit AT91SAM9X35-EK AT91SAM9X35-EK Data Sheet

987

SAM9X35 [DATASHEET]

11055E–ATARM–10-Mar-2014

The data framing format of both the transmitter and the receiver are programmable through the Transmitter Frame Mode
Register (SSC_TFMR) and the Receiver Frame Mode Register (SSC_RFMR). In either case, the user can independently
select:



the event that starts the data transfer (START)



the delay in number of bit periods between the start event and the first data bit (STTDLY)



the length of the data (DATLEN)



the number of data to be transferred for each start event (DATNB).



the length of synchronization transferred for each start event (FSLEN)



the bit sense: most or lowest significant bit first (MSBF)

Additionally, the transmitter can be used to transfer synchronization and select the level driven on the TD pin while not in
data transfer operation. This is done respectively by the Frame Sync Data Enable (FSDEN) and by the Data Default
Value (DATDEF) bits in SSC_TFMR.

Note:

1. Example of input on falling edge of TF/RF.

SSC_TFMR

SSC_RFMR

DATLEN

Up to 32

Size of word

SSC_TFMR

SSC_RFMR

DATNB

Up to 16

Number of words transmitted in frame

SSC_TFMR

SSC_RFMR

MSBF

Most significant bit first

SSC_TFMR

SSC_RFMR

FSLEN

Up to 16

Size of Synchro data register

SSC_TFMR

DATDEF

0 or 1

Data default value ended 

SSC_TFMR

FSDEN

Enable send SSC_TSHR

SSC_TCMR

SSC_RCMR

PERIOD

Up to 512

Frame size

SSC_TCMR

SSC_RCMR

STTDLY

Up to 255

Size of transmit start delay

Sync Data

Default

STTDLY

Sync Data

Ignored

RD

Default

Data

DATLEN

Data

Data

Data

DATLEN

Data

Data

Default

Default

Ignored

Sync Data

Sync Data

FSLEN

TF/RF

(1)

Start

Start

From SSC_TSHR

From SSC_THR

From SSC_THR

From SSC_THR

From SSC_THR

To SSC_RHR

To SSC_RHR

To SSC_RSHR

TD

(If FSDEN = 0)

TD

(If FSDEN = 1)

DATNB

PERIOD

FromDATDEF

FromDATDEF

From  DATDEF

From  DATDEF