Datasheet

SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
310
24.4.16 Source Software Transaction Request Register
Name: DMAC_ReqSrcReg
Address: 0x00800368
Access: Read/Write
A bit is assigned for each channel in this register. DMAC_ReqSrcReg[n] is ignored when software handshaking is not
enabled for the source of channel n.
A channel SRC_REQ bit is written only if the corresponding channel write enable bit in the REQ_WE field is asserted on
the same AMBA write transfer.
For example, writing 0x101 writes a 1 into DMAC_ReqSrcReg[0], while DMAC_ReqSrcReg[2:1] remains unchanged. Writ-
ing hex 0x0yy leaves DMAC_ReqSrcReg[2:0] unchanged. This allows software to set a bit in the DMAC_ReqSrcReg
register without performing a read-modified write
• SRC_REQx: Source Request
• REQ_WEx: Request Write Enable
0: Write disabled
1: Write enabled
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
––––––REQ_WE1REQ_WE0
76543210
––––––SRC_REQ1SRC_REQ0