Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet
Product codes
ATSAM4L-XPRO
151
42023E–SAM–07/2013
ATSAM4L8/L4/L2
11.6.7
Unlock Register
Name: UNLOCK
Access Type:
Write-Only
Offset: 0x018
Reset Value:
0x00000000
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.
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 of the register to unlock to this field.
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]