SAM4L Datasheet, PDF (222/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

13.7.7 Unlock Register
Name:
Access Type:
Offset:
Reset Value:
UNLOCK
Write-only
0x0018
0x00000000
ATSAM4L4/L2
31
30
29
28
27
26
25
24
KEY
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
-
-
-
-
-
-
9
8
ADDR[9:8]
7
6
5
4
3
2
1
0
ADDR[7:0]
To unlock a write protected register, first write to the UNLOCK register with the address of the register to unlock in the ADDR
field and 0xAA in the KEY field. Then, in the next PB access write to the register specified in the ADDR field.
• KEY: Unlock Key
Write this bit field to 0xAA to enable unlock.
• ADDR: Unlock Address
Write the address offset of the register to unlock to this field.
42023C–SAM–02/2013
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