Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Hoja De Datos
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AT91SAM9N12-EK
254
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
23.7.45 PIO Write Protection Mode Register
Name:
PIO_WPMR
Addresses:
0xFFFFF4E4 (PIOA), 0xFFFFF6E4 (PIOB), 0xFFFFF8E4 (PIOC), 0xFFFFFAE4 (PIOD)
Access:
Read/Write
Reset:
See
For more information on write-protecting registers, refer to
• WPEN: Write Protection Enable
0: Disables the write protection if WPKEY corresponds to 0x50494F (“PIO” in ASCII).
1: Enables the write protection if WPKEY corresponds to 0x50494F (“PIO” in ASCII).
for the list of registers that can be 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
7
6
5
4
3
2
1
0
–
–
–
–
–
–
–
WPEN
Value
Name
Description
0x50494F
PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit. Always reads
as 0.
as 0.