13.14.8.19 Channel Control B


Bit	31	30	29	28	27	26	25	24
							CMD[1:0]
Access							R/W	R/W
Reset							0	0


Bit	23	22	21	20	19	18	17	16
	TRIGACT[1:0]
Access	R/W	R/W
Reset	0	0


Bit	15	14	13	12	11	10	9	8
			TRIGSRC[5:0]
Access			R/W	R/W	R/W	R/W	R/W	R/W
Reset			0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
		LVL[1:0]		EVOE	EVIE	EVACT[2:0]
Access		R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset		0	0	0	0	0	0	0

Bits 25:24 – CMD[1:0] Software Command

These bits define the software commands. Refer to 13.14.6.3.2 Channel Suspend and 13.14.6.3.3 Channel Resume and Next Suspend Skip.

These bits are not enable-protected.


CMD[1:0]	Name	Description
0x0	NOACT	No action
0x1	SUSPEND	Channel suspend operation
0x2	RESUME	Channel resume operation
0x3	-	Reserved

Bits 23:22 – TRIGACT[1:0] Trigger Action

These bits define the trigger action used for a transfer.


TRIGACT[1:0]	Name	Description
0x0	BLOCK	One trigger required for each block transfer
0x1	—	Reserved
0x2	BEAT	One trigger required for each beat transfer
0x3	TRANSACTION	One trigger required for each transaction

Bits 13:8 – TRIGSRC[5:0] Trigger Source

These bits define the peripheral trigger which is the source of the transfer. For details on trigger selection and trigger modes, refer to 13.14.6.2.6 Transfer Triggers and Actions and CHCTRLB.TRIGACT.

Value	Name	Description
0x00	DISABLE	Only software/event triggers
0x01	SERCOM0 RX	SERCOM0 RX Trigger
0x02	SERCOM0 TX	SERCOM0 TX Trigger
0x03	SERCOM1 RX	SERCOM1 RX Trigger
0x04	SERCOM1 TX	SERCOM1 TX Trigger
0x05	SERCOM2 RX	SERCOM2 RX Trigger
0x06	SERCOM2 TX	SERCOM2 TX Trigger
0x07	SERCOM3 RX	SERCOM3 RX Trigger
0x08	SERCOM3 TX	SERCOM3 TX Trigger
0x09	SERCOM4 RX	SERCOM4 RX Trigger
0x0A	SERCOM4 TX	SERCOM4 TX Trigger
0x0B	TCC0 OVF	TCC0 Overflow Trigger
0x0C	TCC0 MC0	TCC0 Match/Compare 0 Trigger
0x0D	TCC0 MC1	TCC0 Match/Compare 1 Trigger
0x0E	TCC0 MC2	TCC0 Match/Compare 2 Trigger
0x0F	TCC0 MC3	TCC0 Match/Compare 3 Trigger
0x10	TCC1 OVF	TCC1 Overflow Trigger
0x11	TCC1 MC0	TCC1 Match/Compare 0 Trigger
0x12	TCC1 MC1	TCC1 Match/Compare 1 Trigger
0x13	TCC2 OVF	TCC2 Overflow Trigger
0x14	TCC2 MC0	TCC2 Match/Compare 0 Trigger
0x15	TCC2 MC1	TCC2 Match/Compare 1 Trigger
0x16	TC0 OVF	TC0 Overflow Trigger
0x17	TC0 MC0	TC0 Match/Compare 0 Trigger
0x18	TC0 MC1	TC0 Match/Compare 1 Trigger
0x19	TC1 OVF	TC1 Overflow Trigger
0x1A	TC1 MC0	TC1 Match/Compare 0 Trigger
0x1B	TC1 MC1	TC1 Match/Compare 1 Trigger
0x1C	Reserved	Reserved
0x1D	Reserved	Reserved
0x1E	Reserved	Reserved
0x1F	Reserved	Reserved
0x20	Reserved	Reserved
0x21	Reserved	Reserved
0x22	TC4 OVF	TC4 Overflow Trigger
0x23	TC4 MC0	TC4 Match/Compare 0 Trigger
0x24	TC4 MC1	TC4 Match/Compare 1 Trigger
0x25	ADC RESRDY	ADC Result Ready Trigger
0x26	Reserved	Reserved
0x27	Reserved	Reserved
0x28 - 0x2B	Reserved	Reserved
0x2C	Reserved	Reserved
0x2D	Reserved	Reserved

Bits 6:5 – LVL[1:0] Channel Arbitration Level

These bits define the arbitration level used for the DMA channel, where a high level has priority over a low level. For further details on arbitration schemes, refer to 13.14.6.2.4 Arbitration.

These bits are not enable-protected.


TRIGACT[1:0]	Name	Description
0x0	LVL0	Channel Priority Level 0
0x1	LVL1	Channel Priority Level 1
0x2	LVL2	Channel Priority Level 2
0x3	LVL3	Channel Priority Level 3

Bit 4 – EVOE Channel Event Output Enable

This bit indicates if the Channel event generation is enabled. The event will be generated for every condition defined in the descriptor Event Output Selection (BTCTRL.EVOSEL).

This bit is available only for the least significant DMA channels. Refer to USERm and CHANNELn of the Event System for details.

Value	Description
0	Channel event generation is disabled.
1	Channel event generation is enabled.

Bit 3 – EVIE Channel Event Input Enable

This bit is available only for the least significant DMA channels. Refer to USERm and CHANNELn of the Event System for details.

Value	Description
0	Channel event action will not be executed on any incoming event.
1	Channel event action will be executed on any incoming event.

Bits 2:0 – EVACT[2:0] Event Input Action

These bits define the event input action, as shown below. The action is executed only if the corresponding EVIE bit in the CHCTRLB register of the channel is set.

This bit is available only for the least significant DMA channels. Refer to USERm and CHANNELn of the Event System for details.


EVACT[2:0]	Name	Description
0x0	NOACT	No action
0x1	TRIG	Normal Transfer and Conditional Transfer on Strobe trigger
0x2	CTRIG	Conditional transfer trigger
0x3	CBLOCK	Conditional block transfer
0x4	SUSPEND	Channel suspend operation
0x5	RESUME	Channel resume operation
0x6	SSKIP	Skip next block suspend action
0x7	—	Reserved

Name:	CHCTRLB
Offset:	0x44
Reset:	0x00000000
Property:	PAC Write-Protection, Enable-Protected