Datasheet

648
42023E–SAM–07/2013
ATSAM4L8/L4/L2
24.7.19 Write Protect Mode Register
Register Name:
WPMR
Access Type: Read-write
Offset: 0xE4
Reset Value: See Table 24-17
• 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 624
• ”Baud Rate Generator Register” on page 635
• ”Receiver Time-out Register” on page 637
• ”Transmitter Timeguard Register” on page 638
• ”FI DI Ratio Register” on page 639
• ”IrDA Filter Register” on page 641
• ”Manchester Configuration Register” on page 642
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]
76543210
-------WPEN