32.6.4 DMA, Interrupts and Events

Table 32-4. Module Request for SERCOM USART
ConditionRequest
DMA Interrupt Event
Data Register Empty (DRE)Yes

(request cleared when data is written)

YesNA
Receive Complete (RXC)Yes

(request cleared when data is read)

Yes
Transmit Complete (TXC)NAYes
Receive Start (RXS)NAYes
Clear to Send Input Change (CTSIC)NAYes
Receive Break (RXBRK)NAYes
Error (ERROR)NAYes
Table 32-5. Module Request for SERCOM USART
ConditionRequest
DMA Interrupt Event

Standard (DRE): Data Register Empty

FIFO (DRE): at least TXTRHOLD locations in TX FIFO are empty

Yes

(request cleared when data is written)

YesNA

Standard (RXC): Receive Complete

FIFO (RXC): at least RXTRHOLD data available in RX FIFO, or a last word available and length frame reception completed.

Yes

(request cleared when data is read)

Yes

Standard (TXC): Transmit Complete

FIFO (TXC): Transmit Complete and TX FIFO is empty

NAYes
Receive Start (RXS)NAYes
Clear to Send Input Change (CTSIC)NAYes
Receive Break (RXBRK)NAYes
Error (ERROR)NAYes