Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK データシート

919

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

A transmitted frame is triggered by a start event and can be followed by synchronization data before data transmission.

The start event is configured by setting the Transmit Clock Mode Register (SSC_TCMR). 

The frame synchronization is configured setting the Transmit Frame Mode Register (SSC_TFMR). 

To transmit data, the transmitter uses a shift register clocked by the transmitter clock signal and the start mode selected
in the SSC_TCMR. Data is written by the application to the SSC_THR register then transferred to the shift register
according to the data format selected.

When both the SSC_THR and the transmit shift register are empty, the status flag TXEMPTY is set in SSC_SR. When
the Transmit Holding register is transferred in the Transmit shift register, the status flag TXRDY is set in SSC_SR and
additional data can be loaded in the holding register.

Transmit Shift Register

TD

SSC_TFMR.FSLEN

SSC_TFMR.DATLEN

SSC_TCMR.STTDLY
SSC_TFMR.FSDEN
SSC_TFMR.DATNB
SSC_TFMR.DATDEF
SSC_TFMR.MSBF

SSC_TCMR.STTDLY != 0

SSC_TFMR.FSDEN

1

0

TX Controller

SSC_TCMR.START

RF

Start

Selector

TXEN

RX Start

TXEN

RF

Start

Selector

RXEN

RC0R

TX Start

TX Start

Transmitter Clock

TX Controller counter reached STTDLY

SSC_RCMR.START

SSC_THR

SSC_TSHR

SSC_CRTXEN

SSC_SRTXEN

SSC_CRTXDIS