Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Data Sheet

 620

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

 has a value other than 0.

0 = No rising edge detected on NSS pin since last read.

1 = A rising edge occurred on NSS pin since last read.

0 = As soon as data is written in SPI_TDR.

1 = SPI_TDR and internal shifter are empty. If a transfer delay has been defined, TXEMPTY is set after the completion of such 
delay.

0 = No underrun has been detected since the last read of SPI_SR.

1 = A transfer begins whereas no data has been loaded in the Transmit Data Register.

0 = SPI is disabled.

1 = SPI is enabled.

Note:

1. SPI_RCR, SPI_RNCR, SPI_TCR, SPI_TNCR are physically located in the PDC.