Datasheet

451
SAM9G25 [DATASHEET]
11032C–ATARM–25-Jan-13
30.7.11 DDRSDRC Write Protect Mode Register
Name: DDRSDRC_WPMR
Address: 0xFFFFE8E4
Access: Read-write
Reset See Table 30-16
• 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 437
• “DDRSDRC Refresh Timer Register” on page 438
• “DDRSDRC Configuration Register” on page 439
• “DDRSDRC Timing Parameter 0 Register” on page 442
• “DDRSDRC Timing Parameter 1 Register” on page 444
• “DDRSDRC Timing Parameter 2 Register” on page 445
• “DDRSDRC Memory Device Register” on page 448
• “DDRSDRC High Speed Register” on page 450
• WPKEY: Write Protect KEY
Should be written at value 0x444452 (“DDR” in ASCII). Writing any other value in this field aborts the write operation of the WPEN
bit. Always reads as 0.
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