Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
506
26.8.19 DMAC Write Protect Mode Register
Name: DMAC_WPMR
Address: 0x400C01E4
Access: Read-write
Reset: See Table 26-4
 WPEN: Write Protect Enable
0 = Disables the Write Protect if WPKEY corresponds to 0x444D41 (“DMA” in ASCII).
1 = Enables the Write Protect if WPKEY corresponds to 0x444D41 (“DMA” in ASCII).
Protects the registers:
•“DMAC Global Configuration Register” on page 486
•“DMAC Enable Register” on page 487
•“DMAC Channel x [x = 0..3] Source Address Register” on page 498
•“DMAC Channel x [x = 0..3] Destination Address Register” on page 499
•“DMAC Channel x [x = 0..3] Descriptor Address Regis ter” on page 500
•“DMAC Channel x [x = 0..3] Control A Register” on page 501
•“DMAC Channel x [x = 0..3] Control B Register” on page 502
•“DMAC Channel x [x = 0..3] Configuration Register” on pag
e 504
 WPKEY: Write Protect KEY
31 30 29 28 27 26 25 24
WPKEY
23 22 21 20 19 18 17 16
WPKEY
15 14 13 12 11 10 9 8
WPKEY
76543210
–––––––WPEN
Value Name Description
0x444D41 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit.
Always reads as 0.