Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
![Atmel](https://files.manualsbrain.com/attachments/0369829915bda09f9c2e00fb805a7753579683b5/common/fit/150/50/8d2bf08978ec3e5bc63f4343ac5e91ce8d0e40045619fa520d910d64af8f/brand_logo.png)
Product codes
ATSAMD21-XPRO
760
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
31.8 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.
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
Write-Protected property in each individual register description. Please refer to the
Write-Protected property in each individual register description. Please refer to the
for details.
Some registers require synchronization when read and/or written. Synchronization is denoted by the Write-Synchronized
or the Read-Synchronized property in each individual register description. Refer to
or the Read-Synchronized property in each individual register description. Refer to
details.
Some registers are enable-protected, meaning they can only be written when the USB is disabled. Enable-protection is
denoted by the Enable-Protected property in each individual register description.
denoted by the Enable-Protected property in each individual register description.