Datasheet

Count Value register (COUNT): synchronization is done on demand through READSYNC command
(CTRLBSET.CMD)
Pattern and Pattern Buffer registers (PATT and PATTB)
Waveform register (WAVE)
Period Value and Period Buffer Value registers (PER and PERB)
Compare/Capture Channel x and Channel x Compare/Capture Buffer Value registers (CCx and
CCBx)
Required write-synchronization is denoted by the "Write-Synchronized" property in the register
description.
Required read-synchronization is denoted by the "Read-Synchronized" property in the register
description.
Related Links
14.3 Register Synchronization
SAM D21 Family
TCC – Timer/Counter for Control Applications
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Datasheet Complete
DS40001882D-page 741