Datasheet

458
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
31.7.11 DDRSDRC Write Protect Mode Register
Name: DDRSDRC_WPMR
Address: 0xFFFFE8E4
Access: Read-write
Reset: See Table 31-16
• WPEN: Write Protect Enable
0: Disables the Write Protect if WPKEY corresponds to 0x444452 (“DDR” in ASCII).
1: Enables the Write Protect if WPKEY corresponds to 0x444452 (“DDR” in ASCII).
Protects the registers:
 “DDRSDRC Mode Register” on page 444
 “DDRSDRC Refresh Timer Register” on page 445
 “DDRSDRC Configuration Register” on page 446
 “DDRSDRC Timing Parameter 0 Register” on page 449
 “DDRSDRC Timing Parameter 1 Register” on page 451
 “DDRSDRC Timing Parameter 2 Register” on page 452
 “DDRSDRC Memory Device Register” on page 455
 “DDRSDRC High Speed Register” on page 457
• 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
0x444452 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit.
Always reads as 0.