Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
318
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
19.8.2 DMAC SRAM Registers
19.8.2.1 Block Transfer Control
The BTCTRL register offset is relative to (BASEADDR or WRBADDR) + Channel Number * 0x10
Name:
BTCTRL
Offset:
0x00
z
Bits 15:13 – STEPSIZE[2:0]: Address Increment Step Size
These bits select the address increment step size, as shown in
These bits select the address increment step size, as shown in
nation address, depending on STEPSEL setting.
Table 19-11. Address Increment Step Size
z
Bit 12 – STEPSEL: Step Selection
This bit selects if source or destination addresses are using the step size settings, according to
This bit selects if source or destination addresses are using the step size settings, according to
.
Table 19-12. Step Selection
z
Bit 11 – DSTINC: Destination Address Increment Enable
0: The Destination Address Increment is disabled.
1: The Destination Address Increment is enabled.
Writing a zero to this bit will disable the destination address incrementation. The address will be kept fixed during
the data transfer.
0: The Destination Address Increment is disabled.
1: The Destination Address Increment is enabled.
Writing a zero to this bit will disable the destination address incrementation. The address will be kept fixed during
the data transfer.
Bit
15
14
13
12
11
10
9
8
STEPSIZE[2:0]
STEPSEL
DSTINC
SRCINC
BEATSIZE[1:0]
Bit
7
6
5
4
3
2
1
0
BLOCKACT[1:0]
EVOSEL[1:0]
VALID
STEPSIZE[2:0]
Name
Description
0x0
X1
Next ADDR <- ADDR + BEATSIZE * 1
0x1
X2
Next ADDR <- ADDR + BEATSIZE * 2
0x2
X4
Next ADDR <- ADDR + BEATSIZE * 4
0x3
X8
Next ADDR <- ADDR + BEATSIZE * 8
0x4
X16
Next ADDR <- ADDR + BEATSIZE * 16
0x5
X32
Next ADDR <- ADDR + BEATSIZE * 32
0x6
X64
Next ADDR <- ADDR + BEATSIZE * 64
0x7
X128
Next ADDR <- ADDR + BEATSIZE * 128
STEPSEL
Name
Description
0x0
DST
Step size settings apply to the destination address
0x1
SRC
Step size settings apply to the source address