Data Sheet

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Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
Table 19-15. Event Output Selection
z Bit 0 – VALID: Descriptor Valid
0: The descriptor is not valid.
1: The descriptor is valid.
Writing a zero to this bit in the Descriptor or Write-Back memory will suspend the DMA channel operation when
fetching the corresponding descriptor.
The bit is automatically cleared in the Write-Back memory section when channel is aborted, when an error is
detected during the block transfer, or when the block transfer is completed.
EVOSEL[1:0] Name Description
0x0 DISABLE Event generation disabled
0x1 BLOCK Event strobe when block transfer complete
0x2 Reserved
0x3 BEAT Event strobe when beat transfer complete