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

0: The configuration of the corresponding I/O pin in the half-word group will be left unchanged.

1: The configuration of the corresponding I/O pin in the half-word pin group will be updated.

These bits will always read as zero.