Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
749
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
39.12.12 TWI Write Protection Mode Register
Name:
TWI_WPMR
Addresses:
0xF80100E4 (0), 0xF80140E4 (1)
Access:
Read-write
• WPEN: Write Protect Enable
0: Disables the Write Protect if WPKEY corresponds to 0x545749 (“TWI” in ASCII).
1: Enables the Write Protect if WPKEY corresponds to 0x545749 (“TWI” in ASCII).
The write protected registers are:
• WPKEY: Write Protect 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
0x545749
PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit.
Always reads as 0
Always reads as 0