Datasheet

813
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
 TXBUFE: TX Buffer Empty
0: SPI_TCR
(1)
or SPI_TNCR
(1)
has a value other than 0.
1: Both SPI_TCR
(1)
and SPI_TNCR
(1)
have a value of 0.
 NSSR: NSS Rising
0: No rising edge detected on NSS pin since the last read.
1: A rising edge occurred on NSS pin since the last read.
 TXEMPTY: Transmission Registers Empty
0: As soon as data is written in SPI_TDR.
1: SPI_TDR and internal shift register are empty. If a transfer delay has been defined, TXEMPTY is set after the end of this
delay.
 UNDES: Underrun Error Status (Slave mode Only)
0: No underrun has been detected since the last read of SPI_SR.
1: A transfer starts whereas no data has been loaded in SPI_TDR.
 SPIENS: SPI Enable Status
0: SPI is disabled.
1: SPI is enabled.
Note: 1. SPI_RCR, SPI_RNCR, SPI_TCR, SPI_TNCR are physically located in the PDC.