Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO データシート

501

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

Name: 

DMAC_CTRLAx [x = 0..3]

0x400C0048 [0], 0x400C0070 [1], 0x400C0098 [2], 0x400C00C0 [3]

Read-write

Reset: 0x00000000

This register can only be written if the WPEN bit is cleared in “DMAC Write Protect Mode Register” on page 506



The transfer size relates to the number of transfers to be performed, that is, for writes it refers to the number of source 
width transfers to perform when DMAC is flow controller. For Reads, BTSIZE refers to the number of transfers completed 
on the Source Interface. When this field is set to 0, the DMAC module is automatically disabled when the relevant channel 
is enabled.







0: The transfer is performed.

1: If SOD field of DMAC_CFG register is set to true, then the DMAC is automatically disabled when an LLI updates the 
content of this register.

The DONE field is written back to memory at the end of the current descriptor transfer.

31

30

29

28

27

26

25

24

DONE

–

DST_WIDTH

–

–

SRC_WIDTH

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

–

15

14

13

12

11

10

9

8

BTSIZE

7

6

5

4

3

2

1

0

BTSIZE

00

BYTE

the transfer size is set to 8-bit width

01

HALF_WORD

the transfer size is set to 16-bit width

1X

WORD

the transfer size is set to 32-bit width

00

BYTE

the transfer size is set to 8-bit width

01

HALF_WORD

the transfer size is set to 16-bit width

1X

WORD

the transfer size is set to 32-bit width