Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
920
38.7.10 Register Write Protection
To prevent any single software error from corrupting USART behavior, certain registers in the address space can
be write-protected by setting the WPEN bit in the “USART Write Protection Mode Register” (US_WPMR).
If a write access to a write-protected register is detected, the WPVS flag in the “USART Write Protection Status
Register” (US_WPSR) is set and the field WPVSRC indicates the register in which the write access has been
attempted.
The WPVS bit is automatically cleared after reading the US_WPSR.
The following registers can be write-protected:
 “USART Mode Register”
 “USART Baud Rate Generator Register”
 “USART Receiver Time-out Register”
 “USART Transmitter Timeguard Register”
 “USART FI DI RATIO Register”
 “USART IrDA FILTER Register”
 “USART Manchester Configuration Register”