Datasheet

24.8 Register Description
Registers can be 8, 16, or 32 bits wide. Atomic 8-, 16-, and 32-bit accesses are supported. In addition,
the 8-bit quarters and 16-bit halves of a 32-bit register, and the 8-bit halves of a 16-bit register can be
accessed directly.
Some registers are enable-protected, meaning they can only be written when the module is disabled.
Enable-protection is denoted by the "Enable-Protected" property in each individual register description.
Refer to 24.5.8 Register Access Protection.
SAM D21 Family
EVSYS – Event System
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Datasheet Complete
DS40001882D-page 445