Datasheet

267
SAM9M10 [DATASHEET]
6355FATARM12-Mar-13
22.8.12 DDRSDRC Write Protect Mode Register
Name: DDRSDRC_WPMR
Address: 0xFFFFE6E4 (0), 0xFFFFE4E4 (1)
Access: Read-write
Reset: See Table 22-8
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 252
“DDRSDRC Refresh Timer Register” on page 253
“DDRSDRC Configuration Register” on page 254
“DDRSDRC Timing Parameter 0 Register” on page 257
“DDRSDRC Timing Parameter 1 Register” on page 259
“DDRSDRC Timing Parameter 2 Register” on page 260
“DDRSDRC Memory Device Register” on page 263
“DDRSDRC High Speed Register” on page 265
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