Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM3U2E/ADC12B/CHSR#0x0
Channel Status Register
Channel 0 Status
Channel 1 Status
Channel 2 Status
Channel 3 Status
Channel 4 Status
Channel 5 Status
Channel 6 Status
Channel 7 Status
https://github.com/cmsis-svd/cmsis-svd-data