Datasheet

624
32117D–AVR-01/12
AT32UC3C
25.6.16 Write Protection Registers
To prevent any single software error that may corrupt USART behavior, certain address spaces can be write-protected by
setting the WPEN bit in the USART Write Protect Mode Register (WPMR).
If a write access to the protected registers is detected, then the WPVS flag in the USART Write Protect Status Register
(WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
The WPVS flag is reset by writing the USART Write Protect Mode Register (WPMR) with the appropriate access key,
WPKEY.
The protected registers are:
• ”Mode Register” on page 628
• ”Baud Rate Generator Register” on page 640
• ”Receiver Time-out Register” on page 641
• ”Transmitter Timeguard Register” on page 642
• ”FI DI RATIO Register” on page 643
• ”IrDA FILTER Register” on page 645
• ”Manchester Configuration Register” on page 646