Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Data Sheet

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Atmel | SMART SAM D20 [DATASHEET]

Atmel-42129K–SAM-D20_datasheet–06/2014

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 optionally write-protected by the Peripheral Access Controller (PAC). Write-protection is denoted by 
the Write-Protected property in each individual register description. Refer to the 

 and the 

 for details.