Datasheet

619
32072H–AVR32–10/2012
AT32UC3A3
25.7.18 Write Protect Mode Register
Register Name: WPMR
Access Type: Read-write
Offset: 0xE4
Reset Value: See Table 25-17
• 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 596
• ”Baud Rate Generator Register” on page 607
• ”Receiver Time-out Register” on page 609
• ”Transmitter Timeguard Register” on page 610
• ”FI DI Ratio Register” on page 611
• ”IrDA Filter Register” on page 613
• ”Manchester Configuration Register” on page 614
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