SAM4L Datasheet, PDF (643/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
24.7.19 Write Protect Mode Register
Register Name:
WPMR
Access Type:
Read-write
Offset:
0xE4
Reset Value:
See Table 24-17
31
30
29
28
27
26
25
24
WPKEY[23:16]
23
22
21
20
19
18
17
16
WPKEY[15:8]
15
14
13
12
11
10
9
8
WPKEY[7:0]
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
WPEN
• WPKEY: Write Protect KEY
Has to be written to 0x555341 (“USA” in ASCII) in order to successfully write WPEN. This bit always reads as zero. Writing the
correct key to this field clears WPSR.WPVSRC and WPSR.WPVS.
• WPEN: Write Protect Enable
0: Write protection disabled.
1: Write protection enabled.
Protects the registers:
• ”Mode Register” on page 619
• ”Baud Rate Generator Register” on page 630
• ”Receiver Time-out Register” on page 632
• ”Transmitter Timeguard Register” on page 633
• ”FI DI Ratio Register” on page 634
• ”IrDA Filter Register” on page 636
• ”Manchester Configuration Register” on page 637
42023C–SAM–02/2013
643