Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G20/ADC/CHDR#0x0
Channel Disable Register
Channel 0 Disable
Channel 1 Disable
Channel 2 Disable
Channel 3 Disable
https://github.com/cmsis-svd/cmsis-svd-data