Datasheet

321
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
25.7.7 Write Protection Mode Register
Name: MATRIX_WPMR
Address: 0xFFFFDFE4
Access: Read/Write
• WPEN: Write Protection Enable
0: Disables the write protection if WPKEY corresponds to 0x4D4154 (“MAT” in ASCII).
1: Enables the write protection if WPKEY corresponds to 0x4D4154 (“MAT” in ASCII).
See Section 25.6 “Register Write Protection” for the list of registers that can be write-protected.
• WPKEY: Write Protection 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
0x4D4154 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as
0.