Datasheet

271
SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
21.8.12 DDRSDRC Write Protect Mode Register
Name: DDRSDRC_WPMR
Address: 0xFFFFE6E4 (0), 0xFFFFE4E4 (1)
Access: Read/Write
• 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 256
• “DDRSDRC Refresh Timer Register” on page 257
• “DDRSDRC Configuration Register” on page 258
• “DDRSDRC Timing Parameter 0 Register” on page 261
• “DDRSDRC Timing Parameter 1 Register” on page 263
• “DDRSDRC Timing Parameter 2 Register” on page 264
• “DDRSDRC Memory Device Register” on page 267
• “DDRSDRC High Speed Register” on page 269
• 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