Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAME70N20B/SPI0/TDR#0x0
Transmit Data Register
Transmit Data
Peripheral Chip Select
7 (NPCS3): NPCS3 as Chip Select
11 (NPCS2): NPCS2 as Chip Select
13 (NPCS1): NPCS1 as Chip Select
14 (NPCS0): NPCS0 as Chip Select
Last Transfer
https://github.com/cmsis-svd/cmsis-svd-data