Datasheet

787
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
• FCS: Force SPI Chip Select
Applicable if USART operates in SPI master mode (USART_MODE = 0xE):
0: No effect.
1: Forces the Slave Select Line NSS (RTS pin) to 0, even if USART is not transmitting, in order to address SPI slave devices sup-
porting the CSAAT mode (Chip Select Active After Transfer).
• RCS: Release SPI Chip Select
Applicable if USART operates in SPI master mode (USART_MODE = 0xE):
0: No effect.
1: Releases the Slave Select Line NSS (RTS pin).